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.

Question

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.

anonymous · Answer

A

anonymous · Answer

the rest of the sentences are all run ons