Which shows a complex sentence with a correctly indicated main clause ?
AThe ballpark is never interesting, -unless we bring Bruno along-
BEnglish class is so boring, -except when we get to read Shakespeare!-
C-Because were all minors,- no one will rent us a beach house.
DWhenever we look at houses, -my dad says he doesn't want to move.-
I put dashes around the clauses that were bold in the actual question, so those are the clauses the sentence is focusing on
AThe ballpark is never interesting, -unless we bring Bruno along-
BEnglish class is so boring, -except when we get to read Shakespeare!-
C-Because were all minors,- no one will rent us a beach house.
DWhenever we look at houses, -my dad says he doesn't want to move.-