Which of the following is considered the LEAST likely factor in the development of both prosocial and maladaptive behaviors?

A) Underlying intrapsychic conflict
B) Internal processes such as cognition, mediation, and problem solving
C) External environmental events or cues
D) External reinforcers

Underlying intrapsychic conflict is considered the least likely factor in the development of both prosocial and maladaptive behaviors when compared to the other options. This is because prosocial and maladaptive behaviors are more directly influenced by internal processes (such as cognition and problem-solving), external environmental events or cues, and external reinforcers, which have a more observable and immediate impact on behavior. Intrapsychic conflicts, rooted in psychoanalytic theory, involve internal struggles within the mind that may not directly translate to observable behavior in the same way as the other factors.