This single-blank sentence needs your logic. Try putting your own words into the blank first to get the sense of the meaning: proven, shown, provided. 

So, does “contradicted” work? No, since it does not provide the evidence.

How about “validated”? What does valid mean? If you have a valid driver’s license is it legal? Yes…so validated must mean to make it become real…this one might work.

“Obfuscated” sounds like obnoxious, obtuse or obstruct. The prefix “ob-” means against and to obstruct does not work here.

The word “shrouded” sounds like clouded and may mean something similar but “validated” seems like a better fit. And then “befuddled”; what does it sound like? Maybe a nonsense word, have you ever heard “befuddled”? It means muddled, confused, perplexed but even if you did not know the meaning, “validated” works well as an answer.

The separate floor which houses the problematic employees means that they were taken away and kept apart from their coworker. "Quarantined" means precisely this, therefore it is the correct answer choice.

The fact he was uncomfortable with sports is a good clue that having a ball thrown his way was something he hated. The correct choice needs to have a negative connotation. Of all the answer choices, only "cowered," which means recoiled or shrunk away in fear, has the appropriate negative sense.

Because the chef is praised by reviewers, he is doing something to help the flavor of his food. Find the answer choice that means "help" or "improve," which is enhanced. You can also rule out "harmed" and "negated," as they give the same meaning to the sentence.

"Blandish" means coax by using flattery. Robert tried to flatter the young musician, but she was not going to fall for it.

"Constrained" means restricted. Restricted by his belief in nonviolence, Gandhi knew he had to find another way to achieve his goals.

To "discredit" is to harm the reputation of or to disgrace.

"Abdicate" means give up royal power. Since the king had created a scandal with his infidelity or disloyalty, he would likely given up the crown. “Beatify” means make extremely happy or make a saint, “descend” means lower, and “tarnish” means lessen in value—none of which logically answer the question.

"Integrate" means bring together into a unified whole, and in this context we are looking for a word that expresses the merging of the two pieces into one. The contextual clues of "masterfully" and "beautiful" tell us that it should be a positive thing, and this is why "integrate" is chosen over "clash" or "scramble." "Clashing" would imply a bad combination and "scramble" would imply randomness.

The correct answer refers to how the senator, although initially receiving the support of his constituents in the election, lost that support by not following through on his campaign promises ("alienated"). The incorrect answers refer to how the senator pleased his constituents, the opposite of what occurred.