Critical Reasoning (CR) | Re: Educator: Reducing class sizes in our school district would require

The aforesaid explanation just says that option D is restrictive. We can't just say this and dismiss the answer choice.
The OE is a total waste. Also, the explanation seems as if the author knew that the answer is "E" and then he started pouring in the points to convince the reader that answer is E.
GMATNinja mikemcgarry please kindly throw some light on this question.

Regards