sumit411 I would like to help you out in this question mate
Poor reading skills among students of inner-city schools have not resulted from failures in teaching but insufficiently supportive home environments.
(A) not resulted from failures in teaching but -
INCORRECT as parallelism issue not resulted but insufficiently(B) resulted not from failures in teaching but from -
[b]CORRECT, parallel in structure not from X, but from Y. Also it is giving the intended meaning of the sentence[/b]
(C) resulted from failures not in teaching but -
INCORRECT as meaning change completely. Also parallelism violation "not in X, but insufficiently ( Not is followed by preposition and but is followed by adverb ( Insufficiently)(D) resulted from failures not in teaching but have stemmed from -
INCORRECT as meaning change , parallelism violation (Not is followed by preposition and but is followed by verb)
(E) resulted not from failures in teaching but have stemmed from -
INCORRECT , Parallelism issue ( not is followed by preposition and but is followed by verb)
Kindly give kudos if my explanation helped buddy