Which of the Following Is True of a Pregnant Woman's

Which of the following is true of a pregnant woman's calcium-intake?

A) Calcium-rich diets have been found to lead to high blood pressure in pregnant women.
B) Deficiencies in calcium have been found to reduce the risk of developing eclampsia.
C) Deficiencies in calcium have been linked with preterm births and low blood pressure.
D) Uterine ligament cramps indicate that a pregnant woman's diet contains sufficient calcium.