One Thousand Adults Live in Milltown

One thousand adults live in Milltown. Every day, they all leave work at 4:30 p.m., arrive home at exactly 5:00 p.m., and go to bed at 9:00 p.m. Three fundraisers, Alpha, Beta, and Charlie, have targeted Milltown's population. To get a donation, they must call Milltown's residents after they get home from work but before they go to bed. Because the charities raising the funds are identical, the first to call a willing donor will get the donation. Beta's manager has decided that the best time to call is 7:00 p.m. because it is exactly halfway between 5:00 p.m. and bedtime. Which of the following is true?

A) Beta is certain to generate the most donations.
B) Alpha and Charlie will also make calls at 7:00 p.m.
C) Alpha and Charlie will divide up the rest of the market, with one choosing to call at 6:00 p.m. and the other at 8:00 p.m.
D) Beta's manager did not choose wisely.