Question 13

Theo and his family take their bikes to the beach. When they return home, Theo notices that the chains are rusty, but the frames are not. What can Theo conclude from his observations?

the frames and the chains are both made of steel.

the frames and that chains are both made of copper.

the frames are made of aluminum and the chains are made of steel.

the frames are made of silver and the chains are made of copper.