In the Case of Red-Collared Widowbirds, What Evidence Suggests That

In the case of red-collared widowbirds, what evidence suggests that the elaborately long tail of males is an honest signal?

A) Males with the longest tails end up with three times more nesting females in their territories than short-tailed birds.
B) The tail comes at a cost because it increases drag during flight.
C) Males with long tails cannot hold their territories.
D) The tail is a fake symbol and does not imply good genes.