Fresh Air Contractors Agree with a Bar Owner to Install

Multiple Choice

Fresh Air Contractors agree with a bar owner to install a smoke-removal system to remove cigarette smoke from the air.Prior to the start of the work,the city where the bar is located passes an ordinance prohibiting all smoking in bars.The bar owner can:

A) Avoid the contract on the basis of impossibility.
B) Avoid the contract on the basis of commercial impracticability.
C) Avoid the contract on the basis of frustration of purpose.
D) Avoid the contract on the basis of failure of illegality.