Answer:
D. The U.S. and the Soviet Union began the limiting of the arms race and missile counts.
Step-by-step explanation:
The U.S. and the Soviet Union decided to use the Anti Ballistic Missile to defend areas against nuclear weapons. The terms of this treaty, each party or side of that treaty was only allowed to have two complexes of the ABM or the Anti Ballistic Missile. It was supposed to be 100 of them instead of just two. Because of this, they decided 30 years after they signed the treaty, and five years after the Soviet Union was dissolutioned, four of the republics of the Soviet Union agreed with the U.S. to succeed the Union of Soviet Socialist Republics or the USSR's role to be in the treaty.
I hope this answers your question!