Sentence Correction

Hi All,

I have one doubt regarding the "one of the Xs that" usage:

as per my understanding:

one of the Xs <singular verb>
one of the Xs that <plural verb>

Please tell whether my understanding is correct or not ?

Can someone please help me in clarifying the following question if the above is correct:

============================================
Minnesota is the only one of the contiguous forty-eight states that still has a sizable wolf population, and where this predator remains the archenemy of cattle and sheep.
(A) that still has a sizable wolf population, and where
(B) that still has a sizable wolf population, where
(C) that still has a sizable population of wolves, and where
(D) where the population of wolves is still sizable;
(E) where there is still a sizable population of wolves and where

Here OA is "E"....why there is no plural after "there" in the above option.....since we should have one of the Xs that <plural>

Thanks
Mohit