Concept:The word “affable” means friendly and approachable. The required word must be its opposite and correctly fill the gap.
Explanation:“Affable” describes someone who is warm, pleasant, and easy to talk to.
The opposite should describe a hostile or unfriendly attitude.
“Guarded” means cautious or reserved, not necessarily hostile.
“Caution” is a noun meaning carefulness, not an opposite of a personality trait.
“Suspicious” means distrustful, but it does not directly oppose “affable.”
“Antagonistic” means actively hostile or opposed, which is the clearest opposite of “affable.”
Therefore, the correct word is “antagonistic.”
Answer:D. antagonistic