Which of the sentences below is punctuated correctly?

A. I opened the door and my cat ran outside.
B. I opened the door, and my cat ran outside.
C.I opened the door, my cat ran outside

I think it is A?

I ruined my streak.....thank you very much Ms. Sue

No.

Really.....then it's B

Yes. We need a comma between two independent clauses.

I'm rethinking this. The exception to the above rule is when both independent clauses are short. As you can see, it depends upon judgment to determine what is "short." Go back over your text to see if its author defines short.

it is B.

Thank you both...