Final answer:
J&J is using a matrix organizational system, which allows for team-based work across different functional areas within the agency.Hence, the correct answer is option C.
Step-by-step explanation:
J&J, an advertising agency that assigns individuals from various departments to work together on client accounts, is utilizing a matrix organizational system. This system involves employees from different functional areas forming teams to work on specific projects or accounts, combining aspects of both functional and project-based structures. It allows for flexibility and collaboration among departments, catering to the unique demands of each client.