In What Sense Is the Male Hangingfly's Gift of a Fly

In what sense is the male hangingfly's gift of a fly to his mate rather like parental investment, even if the female does not use the fly to help her produce larger or better eggs?

A) The time and energy spent capturing the gift reduce the male's future potential reproductive output.
B) The gift may be used to increase the number of eggs the female produces.
C) The gift makes it more likely that that male will have offspring in the future.
D) The consumption of the fly means the female may live longer, just as parental investment results in parents living longer.