Which sentence is a run-on sentence?

A.
Most humans eat around 3 to 5 pounds of food every day.

B.
Hummingbirds burn food quickly; they must eat two to three times their body weight every day.

C.
Elephants eat large amounts of food, they can consume 600 pounds of food in a day.

D.
A blue whale eats up to 6,000 pounds of food per day, which is only 2 percent of its body weight.
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Respuesta :

A and B are not run-on sentences because A doesn't even have a comma in it. And B has a semicolon. Something that would prevent a run-on sentence.

It comes down to C or D. D has a nonrestrictive clause. 

My finally answer comes to C.