In the pacific war, the americans used a strategy known as , by which they attacked some japanese strongholds and by-assed others

Leapfrogging.

Explanation: "Leapfrogging, also known as island hopping, was a military strategy employed by the Allies in the Pacific War against the Empire of Japan during World War II. The key idea is to bypass heavily fortified enemy islands instead of trying to capture every island in sequence en route to a final target."

Leapfrogging, also known as island hopping,

the answer is 1.. i think

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )