GMAT Sentence Correction (SC) | Re: In nests across North America.....use of that

D has the biggest problem as highlighted below. We can not have possessive of a possessive here.

D.host mothers try to identify their own eggs and weed out the fakes, but the brown-headed cowbird – a brood parasite that sneaks its eggs into other birds’ nests – produces eggs that look very similar tothat of the host’s , making it surprisingly difficult.
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