GMAT Critical Reasoning (CR) | While biodiversity is indispensable to the survival of life on Earth

When answering this question, I relied on CR Bible techniques.
"Two types of answers typically appear in Main Point questions, and both are incorrect:
1. Answers that are true but do not encapsulate the author’s point.
2. Answers that repeat premises of the argument."

So, D is the answer that repeats the premise of the argument.

Then, I used Conclusion identification method, and mentally re-arranged the sentences in the following order:

Author presents an opposing view: For there
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