C. fell should be fall because fell is in the past tense, and fall is future, which is what goes in the sentence
B. Simile
Simile are used to compare one thing with another.
The correct answer is A. Extra innings tack on time to an already long game, but they are necessary to determine a winner.
Explanation:
Sentence 4 "Extra innings tack on time to an already long game, but the end is always the most exciting part" is biased because it includes a subjective opinion "is always the most exciting part", which makes the text lacks neutrality, and therefore influence a specific perspective (bias). According to this, it is necessary to replace the section that includes a personal opinion and replaced it with a fact or neutral statement. Thus, the best option is A because by using "but they are necessary to determine a winner" the writer can preserve the neutrality in the text and avoid bias.
Compound subject
Hope this helped