The forearms and lower legs each contain two bones running roughly parallel to each other. In the forearms, these two bones are the _____________, and in the lower legs, these two bones are the ____________.
A) femur and patella; humerus and clavicle
B) humerus and clavicle; femur and patella
C) tibia and fibula; radius and ulna
D) radius and ulna; tibia and fibula