Learning how to build a nest

[wasim.iit]

Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. Thus, it is difficult to avoid the conclusion that they benefit by their nesting experience.

Which one of the following, if true, would most weaken the argument?

(A) Blackbirds build better nests than other birds.
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.
(E) Up to 25 percent of all birds are killed by predators before they start to nest.

Taken from old LSAT paper.

I'm wondering if "successive trial" (in option B) itself refers to years of nesting "nesting experience".

As far as I get it, the causality provided in the stimulus goes as follows:
(increase in nesting experience over successive trials/seasons) --> (success in breeding)

Option B: (increase in nesting experience over successive trials/seasons) --> (increase in capacity to lay viable eggs)

I fail to understand the gap (increase in capacity to lay viable eggs) and (success in breeding).
Shouldn't (increase in capacity to lay viable eggs) equate to (success in breeding) ?

Is there a flaw in my understanding?

[RonPurewal]

I fail to understand the gap (increase in capacity to lay viable eggs) and (success in breeding).
Shouldn't (increase in capacity to lay viable eggs) equate to (success in breeding) ?

"success in breeding" is a result of...
...1/ laying viable eggs,
...2/ building a good nest.

you are neglecting #2 here... which is interesting, because the entire thesis of the argument is that #2 is ENTIRELY responsible for the "success" of the birds' mating!