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.The solution to the firms' problem will involve:

A) each firm differentiating itself from the others by timing.
B) each firm differentiating itself from the others by geographic location.
C) exploiting perfectly inelastic demand.
D) each firm differentiating itself from the others by quality.