Which of the Following Is NOT an Example of Nuclear

Which of the following is NOT an example of Nuclear Non-Proliferation Treaty (NPT) failure?

A) Iran tried to develop nuclear weapons while a signatory to the NPT.
B) India tested nuclear weapons while a signatory to the NPT.
C) Libya tried to develop nuclear weapons while a signatory to the NPT.
D) Iraq developed a nuclear weapon while a signatory to the NPT.
E) Belarus obtained nuclear weapons when the Soviet Union collapsed.