Choose the alternative which can replace the bold word

Solution

The word "perspicacity" refers to keen insight, sharpness of mind, and the ability to understand things quickly and accurately. The closest synonym is "acumen," which means exceptional insight or intelligence in a particular domain. "Indolence" means laziness, which is the opposite of keen perception."Diffidence" means shyness or lack of confidence, which does not relate to sharp intellectual ability."Ambiguity" refers to vagueness or uncertainty, which contrasts with clarity and insight.Thus, "acumen" is the most appropriate replacement.