Which best corrects the run-on sentence? the big dipper is a group of seven stars they belong to the constellation ursa major.
a. the big dipper is a group of seven stars. belonging to the constellation ursa major.
b. the big dipper is a group. the seven stars belonging to the constellation ursa major.
c. the big dipper is a group of seven stars; belonging to the constellation ursa major.
d. the big dipper is a group of seven stars belonging to the constellation ursa major.