I don't think a correction is necessary. Both parts of the sentence are already in the present tense. Plus, the use of "us" in the beginning of the sentence indicates a personal attachment.
The right answer is B because he doesn't believe that the animals know enough to change.
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Answer: 3 asking for clarification
Explanation:
The functions of the mentioned expressions is asking for clarification. When someone asks for clarification, it simply means that they are being asked to say something so as to get more information regarding a particular thing and thereby understand better.
Based on the question, the person wants to get clarification regarding number 10 as they've different numbers.