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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