Which term means 'having a sharp edge; intellectually sharp; perceptive'?

• A. Eager
• B. Entity
• C. Keen On
• D. Liable

Answer: (C)

Understanding how the word “keen” conveys sharpness is key here. A keen edge means something physically sharp, and a keen mind refers to being perceptive or quick-witted. Among the options, the one that includes the root “keen” best matches that idea of sharpness, which is why it’s the most appropriate choice. The other terms don’t relate to being sharp or perceptive—they mean eager, a thing, or liable, respectively. So this option closest to the intended meaning by carrying the sense of keenness.