The most appropriate conjunctions in the question are:
"But" and "Since".
They were all college students, But their coach thought they could win since they were the American Underdogs.
<h3>What are conjunctions?</h3>
Conjunctions are words that are used to join two or more sentences.
Other examples are:
See the link below for more about conjunctions:
brainly.com/question/708183
The book is mostly about how u keep your life happy and how we keep our own trails
C is your answer,this was very easy but u may be younger
