What Did the ABM Treaty of 1972, an Appropriate Symbol

What did the ABM Treaty of 1972, an appropriate symbol of détente between Russia and America, accomplish?

A) It guaranteed massive American financial aid to the Russians.
B) It allowed the Russians to catch up in their production of anti-ballistic missiles with the U.S.
C) It enabled both countries to trade freely in aircraft and missiles.
D) It pledged the two nations to limit their development of anti-ballistic missile systems thus avoiding a new arms race.
E) It resulted in alliance between the Soviets and the United States directed against Communist China and Mao Zedong, with the letters ABM referring to "All But Mao."