【单选题】

The nurse is teaching breast self-examinationBSE、to a college student. The nurse knows that the client understands the best time to examine her breasts when she says:

A、"I’ll examine my breasts 1 week after my period starts. "
B、"I’ll perform aBSE、just before my period starts. "
C、"I must examine my breasts the same time each day. "
D、"Every time I shower I’ll do a breast examination. "