Answer:
b. social loafing.
Explanation:
Social loafing: The term social loafing is defined as the process of human tendency to complete a task less effortlessly if are around several people, i.e, in a group rather when they are alone. While working in a group improves the tendency of individuals to pool their skills and talent to improve the accomplishment of a given task.
Social loafing is promoted by the group size because if an individual is placed in a small group then he or she might take the responsibility to work in a better way rather than working in a big group.
In the question above, Devin's behavior is most likely the result of social loafing.