Which of the following is a run-on sentence?

Roll the chilled dough into small balls and place them on a greased cookie sheet use a floured fork to press them flat and then bake for 10 minutes.

Add the sliced apples to the melted butter and cook until tender, but do not let them brown.

Knead the dough for about 8 minutes before dividing it into two loaves; let the loaves rise, covered, until they double in size.

Put the milk, orange juice, strawberries, sliced banana, yogurt, and honey into a blender, and mix on slow speed until the mixture is smooth.