GMAT Critical Reasoning (CR) | Technological improvements and reduced equipment costs have

dear experts andmikemcgarry

this question does confused me a lot.

at first, I want to make sure whether my interpretation is correct.
from the prompt,
1/ technology improved, and reduced cost, then the efficiency of solar energy is improved.
2/ the threshold of solar energy = 35, unchanged, doesn't matter others change or not
3/ 35 = the target price of oil , no matter what the original price is, it will raised to
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