Dr. wolfgang would like to conduct a study examining how children learn to use slang words based on listening to their peers. dr. wolfgangs research would benefit if he read the work of a psychologist who investigated observational learning.

Based on the description, dr. wolfgangs research would benefit if he read the work of  alfred bandura, a psychologist who investigated observational learning

Alfred Bandura did several experiments on social cognitive theories that studies the way people learn by observing and imitating other.
Observation and imitation factor in this experiment will help Dr. Wolfgang in understanding why children use slang language by simply being around their peers.

D. it was designed to allow growth