A boy met with a severe accident and there was a fracture in the shaft of a long bone. What do you think is the possible reason for this?

The correct option is C Break in the diaphysis
Diaphysis is the middle portion in the shaft of the long bone in humans. The long bone is hollow and has bone marrow and adipose material. Diaphysis is only present in long bones. Hence when the boy met with a severe accident and there was a fracture in the shaft of a long bone there was a break in the diaphysis. Thus the correct answer is option C.