An accumulation of learned responses is what Skinner used to describe

A) learning.
B) environment.
C) stability.
D) shaping.

Skinner believed that learning is an accumulation of learned responses through experiences with reinforcement and punishment. Option B, environment, is a broad term that encompasses many different factors that can influence behavior. Stability (option C) refers to the consistency of an individual's behavior over time, and shaping (option D) refers to the process of gradually molding behavior through reinforcement of successive approximations. While both stability and shaping are related to learning, they are not the specific term Skinner used to describe it. Therefore, option A is the best choice.