A soccer team of 4th graders is down 2-0 at halftime. Their coach says, "I want to see some fire in your belly. You have to want this. Give everything you've got for the next 45 minutes. Win or lose, when you leave the field today I want you to think 'I did my best, I couldn't have tried any harder.'" Their coach is relying primarily on:

an emotional appeal

Explanation:

An emotional appeal often referred to as pathos, it is a psychological method of persuasion that's designed to create an emotional response.

Identified by Aristotle, aside logic and authority, emotional appeal seek to change an audience member’s emotions by using manipulative words to brings about the recipient’s emotions rather than valid logic to win an argument.

Hence, in this case, the coach is relying on emotional appeal to sway and charge his team players to victory.