A female zig-zag bird, Henrietta, spends 6 months raising her young. The male zig zag bird, George, has one date with Henrietta after she picks him out of Birdsgonewild.com's website lineup and never calls her again. Henrietta's time commitment is an example of:
A. Spite
B. Parental investment
C. Handicap principal
D. Mutual benefit