Which sentence does not correct this run-on sentence?
The Great Lakes are five freshwater lakes Lake Superior is the largest of them.
a. The Great Lakes are five freshwater lakes, and Lake Superior is the largest of them.
b. The Great Lakes are five freshwater lakes. Lake Superior is the largest of them.
c. The Great Lakes are five freshwater lakes; Lake Superior is the largest of them.
d. The Great Lakes are five freshwater lakes, Lake Superior is the largest of them.