Read the sentences below. Which is the best revision?

5. Read the sentences below. Which is the best revision?
I have to do breathing exercises. The saxophone is a wind instrument.
A. I have to do breathing exercises, and the saxophone is a wind instrument.
B. I have to do breathing exercises because the saxophone is a wind instrument.
6. Read the sentences below. Which is the best revision?
My school did not have a budget for music education. My school held a fundraiser. My principal applied for a financial grant.
A. My school did not have a budget for music education, so my school held a fundraiser. My principal applied for a financial grant.
B. Because my school did not have a budget for music education, my school held a fundraiser, and my principal applied for a financial grant.