Which is a correctly written sentence, not a run-on? A. Our car wouldn't start, so Dad called a tow truck to take it to the mechanic. B. Our backyard was all soggy from the rain, the dog's paws were all muddy. C. Our cousins are coming for a visit we plan on taking them to the zoo and the museums. D. The gate to our backyard had been left open our dogs got out while we were gone.