Final answer:
The correct answer is b. Figurehead, as it is the role identified as interpersonal, involving ceremonial and representative duties of a manager.
Step-by-step explanation:
Among the options provided, the role that is categorized as interpersonal is b. Figurehead. In the context of managerial roles defined in management studies, a figurehead refers to a manager who performs ceremonial and symbolic duties as the organization's representative. Other roles like entrepreneur involve decision-making, the monitor involves information processing, and the disseminator involves communication within the organization, but they are not primarily categorized as interpersonal roles.