Ornella,an Expectant Mother,has Been Advised by Her Doctor to Refrain

Ornella,an expectant mother,has been advised by her doctor to refrain from taking all drugs,including over-the-counter drugs.The doctor made this suggestion because

A) many popular over-the-counter drugs are known teratogens.
B) little is known about over-the-counter drugs,so it is best to be cautious and refrain from taking them during pregnancy.
C) many over-the-counter drugs are produced under poor quality-control conditions and may be contaminated with potential teratogens.
D) research suggests that over-the-counter drugs greatly increase the chances of miscarriage.