Answer: Two-factor
Explanation: Two factor theory is the theory that defines about the emotion to be arising from the collaboration of the physiological arousal and cognitive appraisal.It is also known as the Schachter-Singer cognitive emotion theory.
Other options are incorrect because Cannon-Bard theory says emotion is due to physical reactions and the triggers generated by an event at the same point of time.
James-Lange theory states that emotions occur in response to the physiological happenings.Facial feedback theory states that facial expressions are responsible for the influencing the emotional events.