Nora, Who Is Pregnant, Awakens at 2:00 A

Nora, who is pregnant, awakens at 2:00 a.m. craving pickles. The craving probably indicates that:

A) she drank too much water last night.
B) she isn't getting enough sleep at night.
C) her body needs extra salt, which can be found in the pickles.
D) she is experiencing hormone-induced changes in taste.
E) her blood pH is too low and she needs more acidic foods.