Which sentence is a run-on sentence?

Responses

Raccoons have sensitive paws, they can use to feel for food.
Raccoons have sensitive paws, they can use to feel for food.

Skunks let out a horrible smell that is hard to get rid of.
Skunks let out a horrible smell that is hard to get rid of.

Lizards like to lie in the sun; it helps warm their bodies.
Lizards like to lie in the sun; it helps warm their bodies.

Coyotes are coming into the neighborhood because their habitat is shrinking.

Coyotes are coming into the neighborhood because their habitat is shrinking.