"Credible" means believable or trustworthy. The best choice is "reliable" because it also means trustworthy. Considering the other choices, "doable" means able to be done, "sociable" means friendly, and "daring" means courageous. 

The word "dubious" means doubtful or untrustworthy. The best choice is "doubtful" because it is part of the definition of "dubious." Considering the other choices, "double" means two of something, "wrong" means not correct, and "hasty" means quick.

Obscure can be used as a verb or an adjective. As an adjective, it means hard to understand; as a verb, it means to hide. To further help you, reveal means to make known; display means to show; depict means to represent.

"Incoherent" describes someone or something that is unable to be understood.

"Persuasive" is an adjective that means good at convincing others to adopt your viewpoint. So, the answer choice closest in meaning to "persuasive" is "convincing," an adjective that means capable of causing someone to believe that something is true or real. None of the other answers are close in meaning to "persuasive": "weak" means lacking power; "false" means not true; and "extraordinary" means very unusual or remarkable.

If an object is "authentic," it actually is what it is supposed to be as opposed to fake. For example, if a dinosaur bone found at a dig site is found to be authentic, then it truly is a dinosaur bone and not a hoax. "Fraudulent" is clearly wrong, since it is synonymous with "fake" and therefore an antonym. "Striated" means striped and "flagrant" means conspicuous or bold, especially when referring to an offense; these words are also improper choices. Our final answer, the correct one, is "genuine," which means real or authentic.

When you deceive someone, you lie to them. Therefore, the word "deceptive" is an adjective describing someone who is a liar or something that misrepresents the truth. The word can also be used to describe a situation that misrepresents the general truth of a matter. For example, a "deceptive laugh" is one that really is not a laugh—like when someone laughs without really being happy (perhaps to fit in). Also, a big piece of cake could look "deceptively tasty," though it might really be disgusting and poorly made. The look of the cake deceives by making us think it is good.

While being deceptive is a character flaw, it does not mean "vicious" or "wicked." "Deceptive" indicates that something lies or at least misrepresents the truth.  That means that "misleading" is the best option among the answer choices given.

"Improbable" is an adjective that means either "not likely to be true or to happen" or "unexpected and apparently inauthentic." So, we need to pick out an answer choice that means something like "not likely." "Expected" cannot be the correct answer, then, because "expected" means "regarded as likely to happen," making it an antonym, not a synonym, or "improbable." "Unlikely," however, is an adjective that means "not likely to happen, be done, or be true; improbable," and because "unlikely" is the answer choice closest in meaning to "improbable," "unlikely" is the correct answer.

"Incredible" means not able to be believed. "Unbelievable" is a synonym of "incredible." None of the other answer choices are close in meaning to "incredible": "recognizable" means able to be recognized or noticeable; "acceptable" means passable or just meeting a standard; and "edible" means able to be eaten.

"Implicit" is an adjective that means recognized but not actually stated. So, the best answer choice is "implied," which also means recognized but not actually stated. While all of the incorrect answer choices also begin with "im-," none of them are close in meaning to "implicit": "implicated" means accused of a crime; "implacable" means unable to be appeased; and "impecunious" means having no money or very poor.