Which of the following is NOT one of the advised actions for nuclear weapons possessors in order to promote nuclear nonproliferation in other countries?

A) Pledge to not use their weapons to threaten countries without nuclear weapons
B) Maintain their nuclear weapons
C) Ensure nonnuclear states that their neighbors would be prevented from becoming nuclear powers
D) Help countries that have renounced nuclear weapons and accepted international monitoring to acquire nuclear technology for civilian purposes

B