How Have Scientists Concluded That Fetuses Prefer Sweet Flavors

How have scientists concluded that fetuses prefer sweet flavors?

A) When a saccharin-dye combination was injected into the amniotic fluid of some fetuses and dye only was injected into the amniotic fluid of other fetuses, the urine of the saccharin mothers contained more dye than the urine of the no-saccharin mothers.
B) When offered chocolate milk versus orange juice, preterm infants drank more chocolate milk.
C) Fetuses smile more when fed a sugar solution than when fed a saline solution.
D) It is an assumption made based on research conducted with newborns.
E) None of the answers is correct.