Figure 15.2 depicts a one-mile stretch of beach with 100 swimmers distributed evenly along the beach. There are two ice cream vendors - 1 and 2 - on the beach selling an identical product. Assume that each swimmer buys only one ice cream cone and that they prefer to buy ice cream from the nearest vendor. If vendor 1 is at A, and vendor 2 is at E, vendor 2 will gain the most customers by moving to:

A. a spot between A and B.
B. B.
C. C.
D. D.

Answer: A