The correct answer is A. Extra innings tack on time to an already long game, but they are necessary to determine a winner.
Step-by-step 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.