Which one is a run-on sentence? a. if the bus will take the baseball team to the field, they can all go together. b. when mark was severely cut by the broken glass, he lost so much blood that he had to be taken to the hospital. c. the earthquake caused the thirty-story building to fall. d. it is a disgrace when people refuse to practice pollution control, air pollution continues to worsen.

D is a run on sentence. There is a comma splice, which means that the writer used a comma to join sentences where there should not be a comma. To make D a correct sentence, it would be best to put a period where the comma is.

It is a disgrace when people refuse to practice pollution control. Air pollution continues to worsen.

Hope that helps!

his tongue, i believe, was bloody and hanging out of his mouth.

he looked as if he were hungry.

he has several wolf-like qualities; a gray coat, sharp claws and yellow fangs.

those eyes made me feel, dear reader, like the end was near.

as i reached for a stick, he moved to the other side of the hill.

panting and hungry, he looked at me, a defenseless human and he snarled.

well i said my prayers, however, he simply turned and limped off. 

um hi, hope this answer !