Which of the following admissions to the ER would be most likely to be diagnosed with a greenstick fracture?
A. A 20 year old football player who had an opposing player fall on his leg.
B. An 8 year boy who fell out of a tree on to his arm.
C. An 81 year old woman with a history of osteoporosis.
D. A 32 year old woman who fell on her arm while skiing.