The correct answer is A. Ardent.
Ardent means having or showing a strong feeling of love, enthusiasm, or conviction. It is a synonym of passionate, fervent, and zealous.
Impressive means causing admiration, astonishment, or fear. It is a synonym of grand, magnificent, and awe-inspiring.
Sympathetic means feeling or showing sympathy for someone or something. It is a synonym of compassionate, understanding, and caring.
Irresponsible means not showing a willingness to take responsibility for one’s actions. It is a synonym of unreliable, untrustworthy, and careless.
Ardent is the best synonym for impassioned because it shares the meaning of having or showing a strong feeling.