Which of the following is a characteristic of a strong counterclaim?
a. it is based on a research opinion.
b. it expresses a personal opinion.
c. it supports the primary claim of an argument.
d. it demonstrates a logical flaw in part of the claim.

true. the definition explains it: a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. this is a dictionary definition that i have looked up in a dictionary.

i believe your answer would be d. matt saw the lost cat, and he looked for its owner.