(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the waspâ€™s egg-laying behavior. --> Only A remains. Most important cues are "exactly in right numbers" from the stem and "theoretically paracitize" in the choice - so we are not imfering too much
(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. --> Nothing is mentioned about the host defense in the stem. Out
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. --> This is the trickiest one. Still it is not mentioned "how they learn" . Out
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs. --> Of the two processes mentioned phenomena mentioned - what happens if too few eggs/too many eggs - there is no relative comparison of which one is worse or better.
(E) Parasitic wasps use visual clues to calculate the size of a host egg. --> Totally hopeless.
"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."
- Bernard Edmonds