Final answer:
Truman's administration adopted the suggestion of building a massive stockpile of nuclear weapons from NSC-68 as a means to confront the Chinese forces on the Korean peninsula.
Step-by-step explanation:
The suggestion that Truman’s administration adopted from NSC-68 was the U.S. building a massive stockpile of nuclear weapons to check growing Soviet influence. NSC-68, a document recommended by the State Department, called for increased spending on defense as a means to confront the Chinese forces on the Korean peninsula. As a result, Truman more than tripled U.S. defense spending, which reflected the adoption of this suggestion.