Question

evidence in an argument is...
proof that supports your claim.
not important to proving your opinion.
what the other person believes.

Explanation:

In academic and rhetorical contexts, evidence refers to factual, verifiable material that backs up the central claim or thesis of an argument. The other options are incorrect: evidence is critical to validating an opinion, and an opponent's beliefs are counterpoints, not evidence for one's own argument.

Answer:

proof that supports your claim.