Nurse Paul has asked a nursing assistant to ambulate an elderly client. While walking, the client becomes dizzy and falls, fracturing a hip

Nurse Paul has asked a nursing assistant to ambulate an elderly client. While walking, the client becomes dizzy and falls, fracturing a hip. The nurse understands that who is accountable for this injury to the client?
a. The client
b. The hospital
c. The nurse
d. The nursing assistant.