The salt i agreement in 1972 brought a. the creation of documents that officially ended the cold war. b. the us recognition of china for the first time since 1949. c. the regulation of chinese production of missiles that carried nuclear weapons. d. the regulation of soviet production of missiles that carried nuclear weapons.

The answer is D. the regulation of Soviet production of missiles that carried nuclear weapons.

Let's look into it one by one:

A. the creation of documents that officially ended the Cold War.- This is false.

SALT, which is the Strategic Arms Limitation Talks, was a treaty meant for disarmament bewtween the two superpowers namely USA and USSR(Soviet Union). It did not act as an document that officially end the Cold War.

In addition, the even that put Cold War to an end officially is the Malta Summit.

B. the US recognition of China for the first time since 1949.- This is incorrect.

Although the US normalized relationship with China happend at the same period in 1971, SALT did not serve as as the recognition. SALT was between US and USSR, and China is not involved.

The event that marked US recognition towards China was when President Nixon advocated an improve relationship with China and revived China’s membership in the US.

C. the regulation of Chinese production of missiles that carried nuclear weapons.-This is incorrect.

SALT is indeed about limiting nuclear weapons, but again,the treaty was between US and USSR, and China is not involved.

D. the regulation of Soviet production of missiles that carried nuclear weapons. - This is correct.

SALT is held between US and Soviet Union to limit the number of missle launchers and heavy bombers due to the reason that both superpowers wanted a closer relationship,and desire to cut the military expenses.

Therefore,the answer is D.

Hope it helps!