One Thousand Adults Live in Milltown

One thousand adults live in Milltown.All of them leave work at 4:30 p.m.every day and arrive home at exactly 5:00.They all go to bed at 9 p.m.Three fundraisers,Alpha,Beta,and Charlie,have targeted Milltown's population.Because the charities raising the funds are identical,the first to call a willing donor will get the donation.
Refer to the information given above.Beta's manager has decided that the best time to call is 7:00 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 because all potential donors are 2 hours or less away from a phone call.
B) Alpha and Charlie will have an incentive to also make calls at 7:00,causing clustering at the halfway point in the evening.
C) Alpha and Charlie will divide up the rest of the market,with one choosing to call at 6:00 and the other at 8:00.
D) Beta's manager did not choose wisely.