Option 1: Exuberant -> This is a synonym of ebullient, both meaning enthusiastic and energetic, not an antonym.
Option 2: Benevolent -> This means kind or charitable, which is unrelated to the meaning of ebullient.
Option 3: Distress -> This refers to suffering or pain, but doesn't directly oppose the cheerful enthusiasm of ebullient.
Option 4: Gloomy -> This means sad, dark, and melancholic, the direct opposite of ebullient (cheerful and full of energy).
Hence, Option 4: Gloomy -> Ebullient describes someone who is cheerful, enthusiastic, and full of high spirits, while gloomy describes someone who is sad, depressed, and dejected. These words represent opposite emotional states. -> correct