Monkeys Were Trained to Press Five Buttons, "A" Through "E

Multiple Choice

Monkeys were trained to press five buttons, "A" through "E," in alphabetical order.When presented with the smaller subset of keys "B" and "D," they were able to press these keys in order also.This suggests the monkeys learned

A) paired associates.
B) response-outcome associations.
C) stimulus-response associations.
D) serial representations.