In the Contract Between Canada Oil Company and the Government

In the contract between Canada Oil Company and the Government of Iran for the supply of Iranian crude oil, there is a clause that allows either party to end the contract on declaration of war between Canada and Iran, or the imposition of United Nations trade sanctions on either country. This clause is

A) a force majeure clause.
B) an option to terminate.
C) a condition subsequent clause.
D) a frustration of contract clause.
E) an example of laches.