How many people in the front of the vehicles are killed or seriously injured every year

A．Someone who is backing into a parking space.
B．Someone who is picking up the children from the local school.
C．Someone who is delivering invitation letters.
D．Someone who is under 14.

A．make the front seat passengers wear a seat belt
B．make the front seat children under 14 wear a seat belt
C．stop children riding in the front seat
D．wear a seat belt each time he drives