Correct Response: A. Skipping is a more complex locomotor skill than walking, running, hopping, or sliding because it uses a step combined with a hop in an uneven rhythm pattern and also requires skill in balancing, as the step and hop occur on the same foot. Galloping, which is a combination of a walk and a run in an uneven pattern in which one foot chases the other, is typically mastered after achieving competence with running (B). Sliding is a gallop performed sideways (C). Hopping must be learned before skipping as it is an integral component of a skip (D).