Read the paragraph.

(1) baseball is unique because it is the only sport in america that does not have a time clock—although tennis and softball are not timed, either. (2) instead, games last for nine innings, unless there is a tie after the ninth, in which case they go extra innings. (3) nine-inning games last an average of three hours. (4) extra innings tack on time to an already long game, but the end is always the most exciting part. (5) most people in the us watch baseball and are fans of their hometown team.

what is the best way to revise sentence 4 to eliminate bias?

extra innings tack on time to an already long game, but they are necessary to determine a winner.
extra innings tack on time to an already long game, but games with extra innings are usually more interesting.
extra innings tack on time to an already long game, so there should be a rule that puts a time limit on them.
extra innings tack on time to an already long game, so games that are tied after nine should end in a tie.