Dennis, a new medical assistant at Dr. Hernandez's office, notices that Beth has been waiting more than an hour to get an allergy shot. Dennis has never given a shot before, but he decides to give Beth her shot to help Dr. Hernandez. Dennis accidentally gives Beth the wrong shot, however, and she has a severe allergic reaction. Who is liable for the damages caused to Beth?

A. Dr. Hernandez
B. Dennis
C. Dennis and Beth
D. Dennis and Dr. Hernandez