7186. He corroborated the statement of his brother.

✅ The correct answer is option A.
confirmed : (of a person) firmly established in a particular habit, belief, or way of life and unlikely to change their ways.

disproved : prove that (something) is false.

condemned : sentenced to a particular punishment, especially death.

seconded : formally support or endorse (a nomination or resolution or its proposer) as a necessary preliminary to adoption or further discussion.

corroborated : confirm or give support to (a statement, theory, or finding).

Synonym of corroborated is confirmed