Answer:
Psychological factors
Explanation:
Psychological factors: is one of the influential factors in consumer behavior, and it is a term that describes an individual’s response to a marketing message which depends on the consumers' perceptions and attitudes.
Hence, in this case, since Clark knows that it takes six months for the decision to be rendered after going through multiple committee decision sessions. Clark is working with psychology factor, because he understands his customer's perceptions and attitudes when responding to buying or marketing decision.