Observations of Macaques or "Snow Monkeys" by Japanese Scientists in the 1950s

Observations of macaques or "snow monkeys" by Japanese scientists in the 1950s added to evidence that:

A) macaques preferred to eat vegetables that had been mixed with wheat.
B) nonhuman species practice and transmit cultural routines and rites as learned behavior, much as humans do.
C) macaque culture, like that of other monkeys, relies fundamentally on instinct.
D) the cultural behavior of nonhuman species had less in common with humans than had been previously believed.