Answer: (C) Figurehead role
Explanation:
According to the given question, Greg is one of the marketing manager in the manufacturing company and he visited to the old age home where the company organized the Christmas lunch.
The company initiate the social responsibility and based on the given scenario, the Greg is best illustrating the figurehead role.
The figurehead role is one of the essential role of the manager in an organization as it is the responsibility for inspiring the employees of an organization.
Therefore, Option (C) is correct answer.