Which sentence is a run-on sentence?

A.
The cheetah is the fastest land animal; the sailfish is the fastest animal in water.

B.
The gazelle can only run about half as fast as the cheetah.

C.
Snails move very slowly, a banana slug can move 6 inches in two hours.

D.
A professional marathon runner can run 26 miles in just over two hours.

Question

Which sentence is a run-on sentence?	
 
 A.
The cheetah is the fastest land animal; the sailfish is the fastest animal in water.
 
 B.
The gazelle can only run about half as fast as the cheetah.
 
 C.
Snails move very slowly, a banana slug can move 6 inches in two hours.
 
 D.
A professional marathon runner can run 26 miles in just over two hours.

anonymous · Answer

D.it has no type of puncuation but the period