What causes folded mountains to form?
a. collision of continental plates
b. collision of a continental plate with an oceanic plate
c. vertical shifting along a fault line
d. lava emerging from a crack or fissure in the crust

A would be the best answer hope this helps

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey