The answer is: b. Interpersonal
Interpersonal implies establishing relationships or communicating with other people. As a consequence, Angela's preference to study in groups is related to her ability to learn by exchanging information and ideas with others.
The rest of the alternatives are incorrect because visual learning is associated to the sight and studying from diagrams, images and charts; auditory has to do with the sense of hearing; and intrapersonal refers to connecting with one's thoughts, emotions and identity.