Which one of the following sentences is a run-on sentence?

Because Mason wants to do well on his next essay, he makes an appointment with the ILC Writing Center.

Mason makes an appointment with the ILC Writing Center because he wants to do well on his next essay.

Wanting to do well on his next essay, Mason makes an appointment with the ILC Writing Center.

Mason wants to do well on his next essay he makes an appointment with the ILC writing Center.