Daniel's friends are hiding and they jump out and yell "surprise" at his 21st birthday party. daniel's heart is beating out of his chest. "wow, look at how much i'm shaking, i guess you guys really surprised me." which theory of emotion would support this?

The answer is "James-Lange theory of emotion".

This theory gives the idea that emotions happen as a result of physiological reactions to events.The thought which came to known as James Lange theory is that individuals encounter feeling since they see their bodies mental reaction to outer occasions. According to this hypothesis individuals feel tragic in light of the fact that they cry, and in like manner they feel glad since they smile.

Yes it was hope that works