C. Was
It says "my parents or my older sister". The last subject stated is "my older sister" which is singular. And the only choice that's singular is 'was'. So that should be the answer.
He has been groaning for more then a year.
"Did you groan?" ask Dorothy
"I did. I've been groaning for more then a year, and no one has ever heard me before or come to help me."
To describe a person who is not easily irritated or pleasing , gentle
