Answer:
Toward the center of the earth
Explanation:
You can use the eliminating technique to eliminate any of the ones that make no sense.
We can cross out "toward the nearest branch" because we know that gravity is acting on the orange witch would make the orange fall down and not to the side.
We can also cross out "towards the atmosphere" because the atmosphere is up, and once again gravity causes the orange to fall down.
Lastly we can eliminate "towards the middle of the tree" because the orange may fall toward the middle but it wont always do that.
That leaves us with the answer of "towards the center of the earth" because the orange will always be falling down, or toward the center of the earth.
