The two-way interaction between aspects of the environment and aspects of the individual in the shaping of personality traits is called:

A) classical conditioning.
B) congruence.
C) reciprocal determinism.
D) displacement.

Reciprocal determinism is the theory that personality is shaped both by the individual and the environment and that they interact in a dynamic, two-way relationship. This theory is based on the idea that individuals are not passive recipients of their environment, but they actively shape their environment as well. Classical conditioning, congruence, and displacement are not specific theories related to the interaction between the environment and personality traits.