A 65 -Year-Old Man and a 10-Year-Old Boy Were Involved

A 65 -year-old man and a 10-year-old boy were involved in a severe automobile accident. In both patients the thorax had been badly crushed. Radiographic examination revealed that the man had five fractured ribs but the boy had no fractures.
-What is the most likely explanation for this difference in medical findings?

A) The patients were in different seats in the vehicle.
B) The boy was wearing his seat belt and the man was not.
C) The chest wall of a child is very elastic, and fractures of ribs in children are rare.
D) The man anticipated the impact and tensed his muscles, including those of the shoulder girdle and abdomen.