Concept:Distance along the same meridian is found using the difference in latitude, where 1∘ of latitude equals 111 km.Explanation:Town A is at latitude 40∘N and town B is at latitude 10∘N.Difference in latitude =40∘−10∘=30∘.Since 1∘=111 km,Distance =30×111 km =3330 km.Answer:C. 3330 kilometers