Answer: A. You experience physiological changes followed by a feeling of happiness
Explanation: This theory suggests that the origin of emotions is due to physiological changes due to some external events. It was developed by two scientists, William James and Carl Lange. So, due to an external event, there are some physiological changes in the body that precede certain emotions that result from those physiological changes. Physiological changes are in fact a physiological response to an external event that is the impetus for physiological changes. Emotions are the interpretation of these physiological changes.