What Duty Does a Principal Have Concerning Safe Working Conditions

What duty does a principal have concerning safe working conditions?

A) The principal only has a duty to warn agents of known unsafe working conditions.
B) The principal has a duty to provide safe working conditions for the agent,but he does not need to warn the agency of any known unsafe working conditions.
C) The principal has a duty to provide safe working conditions for the agent,warn the agent of any known unsafe working conditions,and make necessary repairs.
D) The principal only has a duty to make necessary repairs to maintain safe working conditions.
E) The principal does not owe a duty of safe working conditions to an agent.