Marta, the public relations manager of a local library, is meeting with the news media regarding a new reading program for children. Marta is performing the role.

Marta is performing the spokesperson role.

Explanation:

By communicating projects, successes and / or perspectives, Public Relation managers build and maintain an advantageous public image for their company or customer, and thus serve as a spokesperson. The role of public relations managers is to answer questions from the press and pitch stories to the media, plan publicity kits and coordinate press conferences. A good PR manager is ultra-engaged and maintains the eye on what's going on in the industries of the clients. They also remain up-to-date about current world events and developments that may affect the industries within which they work.

i think the answer would be b hope this

answer; it can vividly demonstrate product attributes and persuasively explain their corresponding consumer benefits;