Critical Reasoning

Q. Parasitic wasps lay their eggs directly into the eggs of various host insects in exactly the right numbers for any suitable size of host egg. If they laid too many eggs in a host egg, the developing wasp larvae would compete with each other to the death for nutrients and space. If too few eggs were laid, portions of the host egg would decay, killing the wasp larvae.
Which of the following conclusions can properly be drawn from the information above?
(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.
(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps.
(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species.
(D) Failure to lay enough eggs would lead to the death of the developing wasp larvae more quickly than would laying too many eggs.
(E) Parasitic wasps use visual clues to calculate the size of a host egg.

OA is [spoiler](A)[/spoiler]. Why not [spoiler](C)[/spoiler]? [spoiler]Doesn't the first sentence mean that?[/spoiler]
Thanks,
Rohit.

Because we don't know how do they learn to lay eggs, there is nothing about learning, they just know it, it's innate
btw: 1'st sentence says that: the right number of eggs(means constant) and host-egg should be suitable(means not every egg is an appropriate)

Can anyone explain how the OA was arrived at? Thanks!

(B) Host insects lack any effective defenses against the form of predation practiced by parasitic wasps. We don't know that

(C) Parasitic wasps learn from experience how many eggs to lay into the eggs of different host species. Not mentioned in the passage may be they have some other mechanism to determine that.

(D) Failure to lay enough eggs would lead to the D€@th of the developing wasp larvae more quickly than would laying too many eggs. The passage doesn't say anything about the duration of survival in the two cases, it only says about the result.
(E) Parasitic wasps use visual clues to calculate the size of a host egg. We don't know that, they may have some other mechanism to find it out.
Thus only A is left
(A) The size of the smallest host egg that a wasp could theoretically parasitize can be determined from the wasp’s egg-laying behavior.

"Parasitic wasps lay their eggs directly into the eggs of various host insects " - Since the eggs are laid inside the Host egg, the size of Parasitic wasp egg has to be smaller than the host egg.

I would go for A as well. It seems the best and safest among the rest.

I totally agree. Answer should be A