The increasing complexity of animals' behavior is accompanied by an

A) increase in the size of the brainstem.
B) increase in the depth of the corpus callosum.
C) increase in the size of the frontal lobes.
D) increase in the amount of association areas.

Association Areas

Regions of the cerebral cortex that integrate information from various sensory inputs for complex processes like thinking, learning, and memory.

Frontal Lobes

The front part of the brain's cerebral hemispheres, involved in decision making, problem solving, control of purposeful behaviors, consciousness, and emotions.

Complexity

The state or quality of being intricate or complicated, often referring to systems with multiple interrelated components.