Concept Formation Studies Demonstrate That Nonhuman Animals

Concept formation studies demonstrate that nonhuman animals:

A) Cannot form general categories, but must learn about each stimulus individually
B) Can learn basic categories, such as shape or color, but cannot learn more abstract concepts
C) Can learn to differentiate between concrete relative differences between objects (such as bigger, smaller)
D) Can be trained to respond to abstract properties of objects (such as humanness, gender)