which sentence is not a run on sentence
Many sport fans don't mind cold weather therefore the stands are filled in december.
a. Many sport fans don't mind cold weather, therefore the stands are filled in december.
b. Many sport fans don't mind cold weather, therefore, the stands are filled in december.
c. Many sport fans don't mind cold weather, therefore; the stands are filled in december.
d.Many sport fans don't mind cold weather' therefore the stands are filled in december.