Which psychological theory is supported by the observation that facial expressions can amplify the feeling of an emotion?

Explanation

The James-Lange theory proposes that physiological changes, such as facial expressions, contribute to the experience of emotion. This is supported by findings that making certain facial expressions can intensify emotional feelings. Other options, like the adaptation-level principle and relative deprivation, relate to different psychological concepts, while the Cannon-Bard theory suggests emotions and physiological responses occur simultaneously rather than sequentially.