Suppose Sarah Has Been Offered a Position as Web Designer

Suppose Sarah has been offered a position as web designer at Firm A and Firm B. Both firms require their employees to work for 9 hours a day, but Firm A allows its employees to have a flexible work schedule, while Firm B requires its employees to be at work from 9am to 5pm. Otherwise, the jobs are identical. You would expect:

A) Sarah's wages to be the same at both firms.
B) Sarah's wages to be higher at Firm A than at Firm B.
C) Sarah's wages to be lower at Firm A than at Firm B.
D) Sarah to turn down both job offers.