What would be of greatest interest to a cognitive psychologist

A)  information processing 
B)  adolescent identity crisis 
C)  behaviour in small groups 
D)  interpersonal attraction

Cognitive Psychologist

A professional who studies mental processes such as "attention, language use, memory, perception, problem-solving, creativity, and thinking."

Information Processing

Describes the manner in which individuals encode, store, and retrieve information, based on theories comparing the mind to a computer.