Scientific Evidence Has Demonstrated That

Scientific evidence has demonstrated that

A) when saccharin was injected into amniotic fluid, the mothers' urine showed that the fetuses ingested more amniotic fluid because it had been sweetened.
B) when offered chocolate milk versus orange juice, preterm infants drank more chocolate milk.
C) fetuses smiled more when fed a sugar solution than when fed a saline solution.
D) the idea that fetuses prefer sweet flavours is merely an assumption that was made based on research conducted with newborns.