Answer: Tug of war where one team is winning.
Explanation: This might be late, but if you read the question the key word to find your answer is unbalanced. A vase sitting on a desk, A person leaning on a wall that is not moving, and A ball sitting in a field not moving are all examples of balanced forces because all of the objects and person is stationary so that means that the force is balanced. When you're playing tug of war there is always unbalanced forces in play when you're not stationary. This is why D is your answer.