Answer: Option D
Confident : feeling or showing confidence in oneself or one's abilities or qualities.
Angry : feeling or showing strong annoyance, displeasure, or hostility; full of anger.
Feeble : lacking physical strength, especially as a result of age or illness.
Trembling : shaking or quivering, typically as a result of anxiety, excitement, or frailty.
Tremulous : shaking or quivering slightly.
Synonym of Tremulous is Trembling