Based on this excerpt, the author would argue that life in the mountains simple and satisfying. The idyllic way they describe the setting, with gentle wind and beautiful light of the sun shows that it would be a breathtaking place to live. Also, the emotional attachment of the main character to living in the mountains shows that the author thinks it is a desirable scenario.
B. The explanation structure is incorrect making the sentence sound very jibberish.
The answer is C, they present the problem in the first part of the sentence (rather than...) and provide a solution in the second half.
Once upon a time, Mary had melanoma and she died.
The answer is D because that would just be a run on sentence if you left out the semi colon