Humans are a very social species who essentially require interaction between them and other humans. We form societies so that we can divvy up work and get a lot done, while also satisfying the part of us that requires interaction. This is why we've formed languages; so we can communicate with one another and come up with cultures and ideas.
The only internal one I ever learned was character versus self.
The others are external:
Character versus fate
Character versus nature
Character versus character
Character versus society
I think it is D - supporting detail, just a guess tho
Answer:
Extra Swimming Time
Explanation: In the most general terms, an incentive is anything that motivates a person to do something.
