Here's a logic test: Tim is playing with a penny that he found at the beach. Tim rolls the penny around in some new areas. He rolls the penny in the sand and sees that it doesn't go very far. Tim rolls the penny on the concrete sidewalk and sees that the penny rolls for several feet. Tim decides that there was more resistance on the (A) sand (B) concrete sidewalk. Choose the answer between "sand" and "concrete sidewalk".
The answer to this question is:
sand