Sentence Correction (SC) | Re: Unable to build nests or care for their young, a female cowbird lays u

GMATNinja VeritasPrepKarishma egmat

In option (C), why can notthose refer to nests?

How do I takeincluding ? As a noun or as a modifier?
Is there any difference of placement of coma before including and
its absence that would lead to change of role it plays?

Is there any twist in intended meaning in (C)?

I was able to correctly strike off A and B because of paying attention to
their in non-underlined portion which must have a plural noun antecedent.

E has clear subject placement issue