Signed in 1968, Which Treaty Strengthened the International Atomic Energy

Signed in 1968, which treaty strengthened the International Atomic Energy Agency by solidifying the commitment of nonnuclear states not to acquire nuclear weapons and of nuclear states to reduce nuclear arms and share nuclear technology for peaceful uses?

A) the Treaty on the Non-Proliferation of Nuclear Weapons
B) the Comprehensive Test Ban Treaty
C) the Treaty on Conventional Forces in Europe
D) the Nuclear Weapons Convention