A Woman Calls the Clinic Office and Asks the Nurse

A woman calls the clinic office and asks the nurse why she is having spotting between her monthly periods when she is taking birth control pills to control the menorrhagia.The nurse's most appropriate response would be:

A) "Remember to take the pill at the same time each day."
B) "Irregular spotting is to be expected with oral contraceptives."
C) "The pills are still safe. Continue to take them, regardless."
D) "Physicians are still uncertain as to how oral contraceptives function."