Which of the Following Is Not an Exception to the Act

Which of the following is not an exception to the act of state doctrine?

A) A sovereign waives its right to raise the act of state defense.
B) A foreign sovereign contracts to sell a service.
C) A foreign sovereign's decides to grant a license to export a natural resource.
D) There is a claim to property based on the assertion that a foreign state confiscated the property in violation of the principles of international law.