Antonym of “Splenetic” is?

This question requires identifying the antonym (opposite) of the word "Splenetic." "Splenetic" means bad-tempered, irritable, or peevish, often associated with a tendency to be angry or resentful. It derives from the historical belief that the spleen was the seat of melancholy and ill humor.

• Option A: "Calm" is the correct antonym. "Calm" means peaceful, tranquil, and not easily agitated or upset, which is the direct opposite of being splenetic.
• Option B: "Casual" means relaxed and unconcerned, which is not a direct opposite of being irritable.
• Option C: "Gemal" is not a recognized English word.