Why Is the Nuclear Non-Proliferation Treaty (NPT)a Compromise Between Nuclear

Why is the nuclear Non-Proliferation Treaty (NPT) a compromise between nuclear and non-nuclear weapons states?

A) Non-nuclear weapons states abiding by the treaty eventually may be allowed by nuclear powers to develop small nuclear capabilities of their own.
B) Nuclear weapons states keep their nuclear power plants while other states get assistance in developing environmentally friendly non-nuclear sources of energy.
C) Nuclear weapons states can continue underground nuclear weapons testing while other states experience less pollution because of the ban on aboveground testing.
D) Nuclear powers keep their nuclear weapons while other states get assistance in developing nuclear energy.