Marc Hauser (1998) Used Habituation to Determine How Rhesus Monkeys

Marc Hauser (1998) used habituation to determine how rhesus monkeys (Macaca mulatta) classify food calls. He found that when they hear food calls they classify them

A) by their meaning, but only when the food is of high quality.
B) by their meaning; the calls convey information regarding food quality being high or low.
C) by their sound; they have more sounds for low quality food than for high quality food.
D) by their sound; they have up to 25 sounds for both low and high quality food.