PLEASE HELP! BRAINLIEST IF CORRECT! Which variable is most important to the following problem?
Dorothy played the first 17 minutes of the game. Evelyn then replaced her for the rest of the half. Evelyn started the second half and was replaced by Dorothy with 21 minutes left in the game. If each half is 45 minutes long, how many minutes did Evelyn play?

A. the length of a half
B. the amount of time Evelyn played
C. the number of players on a team