Which sentence does not correctly fix this run-on sentence?

Our dog chased a skunk fortunately Dad was able to wash off the smell.









A.
Our dog chased a skunk. Fortunately, Dad was able to wash off the smell.







B.
Our dog chased a skunk, fortunately Dad was able to wash off the smell.







C.
Our dog chased a skunk, and fortunately Dad was able to wash off the smell.







D.
Our dog chased a skunk; fortunately, Dad was able to wash off the smell.