Susan Was Referred to the Mastodon Company by Her Friend

Susan was referred to the Mastodon Company by her friend Angie. Susan has accepted a job in the production department where Angie works. Angie is thrilled to have her friend working with her so that they can now carpool to work. The company will pay Angie a(n) _______ bonus for encouraging Susan to accept the company's employment offer.

A) acceptance
B) up-front
C) flat
D) referral
E) retention