The phrase "In contrast to his father" is an introductory clause, which is not essential to the structure of the sentence but conditions its meaning. Introductory phrases must always be set apart from the rest of the sentence by a comma; therefore, "In contrast to his father, he had" is the correct answer choice.

The use of "been" with the past tense verb "plagued" is awkward and incorrect in the sentence. Either the use of a form of "be" should be removed or the past tense should be changed; therefore "have plagued" is the correct answer choice.

The use of the verb "are," a present tense verb, to describe actions already placed in the past by the use of the verb "were" is confusing and improper. To correct this, the verbs should be made to match; therefore, the correct answer is "no matter how skilled they were at the game."

The non-underlined portion of the sentence uses a past tense verb, "took," to describe the general's actions; therefore, the verb in the underlined portion needs to paralllel the form of "took." The correct answer is "While the opposing army slept," as it is the only grammatically correct choice in the past tense.

The use of "fighting," a participle form, in the sentence makes the sentence not have a proper verb. To be a functional verb, the participle must be used with some form of the verb "to be." The only answer choice that does this is "The boys were fighting every single day for the past three weeks."

The non-underlined portion of the sentence, which is the main body, contains a past tense verb, "was." This means that the underlined portion, a dependent clause, must use the past tense as well. As it is written, the sentence currently contains a present tense verb, "has." The only answer choice that fixes this issue is "as he had a strong artistic side to his personality."

The use of "confuse" is incorrect, as it is a present tense, plural verb. As the subject of the sentence, "novel," is singular, and the main verb of the sentence, "was," is in past tense, so "confuse" should take on a past tense, singular form. The only answer choice featuring such a form is "The novel was a long rambling mess that often confused readers."

The use of the plural verb "receive" is incorrect. Even though the verb is next to the plural "runners," it refers to the singular subject, "fastest." The verb needs to be changed to be in agreement with the subject of the sentence. "The fastest of all the runners receives" is the only answer choice that does this, so it is the correct answer.

The underlined portion of the sentence includes a present tense verb, "remain," while the non-underlined portion of the sentence includes a past tense verb, "said." The two verbs must be in the same tense, as they describe action taking place at the same time. The only answer choice that corrects this issue is "but remained completely silent throughout."

The use of the present tense verb "talk" goes against the introductory clause in the sentence, which places the sentence's action in the past. The main verb of the sentence needs to be in the past tense. Therefore, the correct answer choice is "the two talked for hours and hours, staying up until dawn."