To "impugn" something means to?

To "impugn" something means to call it into question or attack it as false. This term is often used in discussions where someone's integrity, motives, or the validity of their statements are being challenged. When a person impugns another's argument or character, they are expressing doubt about its truthfulness or legitimacy.

In contrast, the other options suggest different actions. Supporting something passionately or celebrating its merits involves promoting or affirming its value, which is the opposite of impugning. Ignoring something completely means not addressing it at all, which also does not align with the action of impugning, as it requires an active challenge or criticism of the subject in question. Therefore, the essence of "impugn" lies in questioning and disputing, making the correct choice clear.