In the 400 Meter Relay,runners Handoff the Baton to the Person

In the 400 meter relay,runners handoff the baton to the person in front of them.The second runner in the relay team had to be replaced .They were unable to pronate their forearm to reach behind for the baton because of injury to their brachial plexus.What is the most likely site of their injury?

A) Dorsal scapular nerve
B) Intercostal nerve
C) Phrenic nerve
D) Median nerve
E) Radial nerve