Aperson who is interested in researching how people learn in educational settings and how motivation and intelligence affect learning would most likely study psychology.

A person who is interested in researching how people learn in educational settings and how motivation and intelligence affect learning would most likely study educational psychology. Educational psychology has to do with education, and how people improve and evolve in a way in such educational surroundings. All of the other options fall under the category of educational psychology, which is their umbrella term.