Ultrasound Testing Reveals That a Woman Is Carrying Conjoined Twins

Ultrasound testing reveals that a woman is carrying conjoined twins.She says,"Why did this happen? I've been so careful to take good care of myself." How should the nurse respond?

A) "There is nothing you could have done to prevent this."
B) "It probably happened before you even knew you were pregnant."
C) "There is no way to find out why it happened,but they can be separated after they are born."
D) "We know that exposure to cigarette smoke is the primary reason for conjoined twins."