The correct answer is: [C]: " hesistant " .
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Others are unable to answer your question if you do not give them more information regarding what you want to be answered. My suggestion is to edit your question so it can be answered properly.
B) The daily work continued; nay, it actually increased;
Something that is happening on a consistent basis. It also gives the feeling that it is work to make it persistent. In option B, the statement "daily work" indicates that something is done daily which supports the idea of persistent. The sentence containing the line "The daily work continued; nay, it actually increased" also includes the description "with an astonishing pertinacity." Pertinacity means persistent determination. The brain failing and life slipping away does not show any persistent determination. Also, the statement that she inquired with acute anxiety does not how any persistent determination.
Answers:
1. Include essential facts and details about global warming
2. Research all there is to know about climate change
3. research how climate change is contributing to the earth
