Think before you speak or Once it's out there, it's out there?
Answer:
B is most relevant thing to say based on argument about allowance.
Explanation:
An independent clause is a sentence or part of one that can stand alone.
So I have a feeling that the first one is correct as "My sister and I love to cook" and "we spend hours cooking together" can both stand alone yet are joined by a semicolon.
I hope this has helped
