Observational learning occurs:
a. through the cognitive processes of reasoning and judgment.
b. when an organism makes a connection between two stimuli.
c. when an organism learns the association between a behavior and a consequence.
d. through the process of watching and imitating another's behavior.

Through the process of watching and imitating another's behavior ( D )

Explanation:

observational learning is a learning process that involves separate process combined into one learning outcome and these processes are : attention, retention, production and motivation.

this is a theory that express how one learns a new behavior or action through the observation or imitation of a character exhibiting or demonstrating some form of behavior unusual to the observer.   example of such observational learning is a child watching a parent play with a toy and learning/imitating the way the parent played with the toy.