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. To an economic naturalist, this scenario would explain why:

A) fundraising calls typically occur shortly before people go to bed.
B) fundraising calls typically occur shortly after people arrive home from work.
C) fundraising calls are outsourced to Asian countries.
D) telephone fundraisers have become less popular.