Question

which is the best definition of rebuttal?an opposing side of the authors argument or viewpointa statement of a viewpoint that supports one side of an argumentan explanation of why an opposing argument is falsea personal opinion or judgment that is not backed by evidence

Explanation:

A rebuttal specifically addresses and disproves an opposing argument by explaining its flaws or falsehood. The other options describe related but distinct concepts: an opposing viewpoint is a counterposition, a supporting statement is affirmative, and an unsupported opinion is a baseless claim.

Answer:

an explanation of why an opposing argument is false