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The argument assumes which one of the following?

  1. All elements of the ecosystem were thoroughly analyzed

  2. The environmentalist has received awards in the past

  3. The public opinion is favorable towards the conclusion

  4. There is no conflicting research on the topic

The correct answer is: All elements of the ecosystem were thoroughly analyzed

The correct answer is A because the argument assumes that all elements of the ecosystem were thoroughly analyzed in order to reach the conclusion presented. This assumption is essential for the argument to hold logical validity. Option B about the environmentalist's awards, option C about public opinion, and option D about conflicting research are not necessary assumptions for the argument to be valid.