Why Is It Especially Important to Maintain Good Relationships with Cosmetic

Why is it especially important to maintain good relationships with cosmetic vendors when there are only a few vendors controlling the cosmetics sold in that market?

A) Cosmetic departments will receive better samples.
B) Cosmetics personnel will receive better training.
C) Department stores will be better able to dictate prices.
D) Buyers can purchase more.
E) Vendors dictate prices.