For Main Point questions, I often ask myself, "what was the most valuable sentence?"
If there is one sentence that feels most like the overarching thesis, or the author's signature opinion, then there is a good chance that the correct answer will paraphrase that line.
Otherwise (on in addition), I ask myself, "what was the purpose of this passage?"
Thinking about what the author was trying to accomplish/convey with the passage forces me to focus on the big picture idea.
In this passage, I feel that lines 19-21 are the most valuable sentence. After all, they foreshadow the function of paragraph 2 and 3 (an example of unsuccessful implementation and an example of successful implementation).
We might also expect the Main Point answer to include the key reason for WHY one was successful and the other not (sufficiently involving the locals).
A) "plagued" and "halted" might be too extreme for the Brazil example. This choice also places effort on "later" vs. "earlier", which is accurate (Brazil was later than India) but seemingly not a relevant concern.
B) This is too far from lines 19-21. The passage is not mainly advice to investors. If anything, it would be advice to people hoping to implement renewable technologies that local investors/industries are used.
C) 1st half is dreamy, 2nd half contradicts the moral of the 2 examples: LOCAL investment/expertise is crucial to long-term viability.
D) Beautiful. 1st half covers the the 1st paragraph, 2nd half covers the 2nd and 3rd paragraphs.
E) We can't support the idea that "wind" is superior to other technologies. The fact that Brazil failed and India succeeded had nothing to do with solar vs. wind, but rather excluding local involvement vs. exploiting local involvement.
(D) is our answer.