Wince has a negative connotation
Because is the correct answer. The word because is connecting the two statements together and explaining how they finished their work.
A description of a character that causes you to dislike them would be the effect of negative character development.
What is the text that this is referring to?
School is preparing you for the real world. Sometimes the job you’re aspiring to do doesn’t fit in with the school curriculum, but it will help you if you get to an accelerated course of study.