Which of the Following Scenarios Is Suspicious for Child Abuse

Which of the following scenarios is suspicious for child abuse?

A) A 4-year-old breaks his femur (midshaft) while learning to ride a bike.
B) A 10-year-old fractured his ulna and radius while skateboarding. His sister was with him and corroborates how he fell.
C) A 12-year-old fell and hit a curb while riding his bike and landed on his shoulder and broke his clavicle
D) A 3-year-old has a left arm radial head subluxation that he sustained while he was playing with his 15- year old cousin who was swinging him around holding his hands.