You are managing a project to build a new wing onto a local school building over a summer break. One night, ?

the school and your construction site are destroyed by a tornado. Your client demands that you continue work despite the disaster, but you consult the contract, and find a clause that states that you are not responsible for any more work. This is referred to as: A. Mitigation B. An "act of God" clause C. A force majeure clause D. An ex parte communication