In order to increase her referent power base,Casey should begin by:

A) volunteering for a project that will showcase her skills.
B) taking advantage of training provided by the company.
C) displaying her diplomas and awards in her office.
D) developing her people skills.

Developing her people skills would help Casey build strong relationships with her coworkers, which would increase her likability and respect among her colleagues. This, in turn, would increase her referent power base. Volunteering for a project or taking advantage of training could also potentially increase her expertise and credibility, but building strong relationships through effective communication and collaboration is a more direct way to increase referent power. Displaying diplomas and awards may enhance her expert power, but it is not directly related to building relationships or increasing referent power.