Which Option Describes a U

Which option describes a U.S.Food and Drug Administration (FDA) safety category C drug?

A) Risk to the fetus cannot be ruled out;either studies in animals have revealed adverse effects on the fetus (teratogenic or embryocidal effects or other) and there are no controlled studies or studies in women and animals are not available.
B) There is no evidence of risk to the human fetus.
C) Controlled studies show no risk to the fetus.
D) There is positive evidence of risk to the fetus,but the benefits from use in pregnant women may be acceptable in certain clinical settings despite the risk.