It should be easiest to teach a child to pick up his toys by utilising the principles and techniques developed by

A) William James.
B) Abraham Maslow.
C) B. F. Skinner.
D) Wilhelm Wundt.

B. F. Skinner

An American psychologist and behaviorist known for his work in developing the theory of operant conditioning.

Child

A young human being, typically one who has not yet reached puberty.

Teach

To impart knowledge or skills to someone through instruction or practical demonstration.