A Good Example of a President "Unsigning" a Treaty Is

A good example of a president "unsigning" a treaty is

A) President George Bush's retraction of the Panama Canal Treaty.
B) President Bill Clinton's rejection of the Kyoto Protocol dealing with environmental controls.
C) President George W. Bush's withdrawal of support for the International Criminal Court.
D) President George W. Bush's withdrawal of support for stem cell research.
E) President Woodrow Wilson's withdrawal of support for the Treaty of Versailles.