Answer:
the man stopped by the park to pet the happy dog. Then, he stepped onto the grimey, cold bus. The bus made many halting stops before it pulled up infront of a local resturant. He jumped out and ran up the icey steps. A while later, he returned with a bag of warms scraps to for the starving dog.
Explanation:
B) After seven years without contact, my old pen pal managed to track me down on the internet, and I was thrilled to hear from her.
Run-on sentences have two parts, each part should be able to stand alone in a sentence.