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 its B

Right.

It is B.

Thank you it is!!

dolphins habitat

You are correct! Sentence B, "I opened the door, and my cat ran outside," is punctuated correctly. The comma after "door" separates the two independent clauses ("I opened the door" and "my cat ran outside"), and the conjunction "and" joins them together. This use of a comma before a coordinating conjunction (like "and") is part of the standard rules of punctuation. The comma helps indicate the pause between clauses and improves the clarity and readability of the sentence.