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Experience gained in implementing therapies that address emotional, social, and cognitive aspects of learning has taught that children with learning disabilities are better served by such holistic interventions rather than by specific accommodations that could potentially entrench a sense of inadequacy in students.
This answer choice is grammatically incorrect. The comparative better can only be followed by than and not rather than.
A rather than B is also a legitimate construction but since better is outside the underlined section and can't be changed, this must be a comparison and the use of rather is incorrect.[[snippet]]
This answer choice corrects the comparative in the original sentence, by removing the word rather:
better served by ... than by[[snippet]]
While this answer choice corrects the comparative mistake in the original sentence, it is stylistically flawed due to redundancy. This kind of holistic intervention is wordy; the original such holistic interventions is more concise. The same goes for being inadequate which is wordy compared to the original inadequacy.
This answer choice is grammatically incorrect. The comparative better can only be followed by than and not instead of.[[snippet]]
While this answer choice corrects the comparative mistake in the original sentence, it changes the meaning of the sentence. The phrase these students refers to specific students, but originally the sentence referred to students in general.
Furthermore, there is no earlier reference to a specific group of students. The only students mentioned in this sentence are referred to generally (children with learning disabilities) and cannot be referred to using the pronoun these.