The correct answer is are probably determined by both psychosocial factors and biological factors.
Sexual arousal is the desire that we have to satisfy our sexual instinct. Sexual attraction is an impulse towards the person. Sexual arousal is a compulsion for the other person.
In sexual attraction we do not aim at satisfying the sexual instinct that desires sexual activity. In excitement, what prevails is the search for sexual activity.
Sexual attraction desires an affective relationship with the person; sexual arousal desires pleasure, sexual orgasm.
Sexual attraction usually unfolds in courtship; sexual arousal always ends either in masturbation or in sexual intercourse.