U didn’t give us the possible answers so we can’t really answer this for you
The answer on E2020 is
C. the belief that engagements and marriages should follow social rules
I just took the Quiz; it's not A.
You should be able to find it in the Table of Content, which is in the very beginning of the book.
Used to listen/ listened
Played
Worked/used to work
Used to write/wrote
Used to light/lit
Used to think/ thought
Went
Invented
Used to play/ played