The Male Wasp, Campsoscolia Ciliata, Transfers Pollen from One Orchid

The male wasp, Campsoscolia ciliata, transfers pollen from one orchid to another orchid of the same species. What "reward" does the male wasp receive from the orchid plants for helping with the orchid pollination?

A) a supply of energy-rich nectar
B) volatile chemical hormones that help the male wasp find a sexually receptive female
C) no reward; the male wasp is deceived by the flower shape and odour
D) successful copulation with the flower
E) a store of nectar that the wasp can use in time of famine