The truman doctrine pledged that the u. s. would
a. drop atomic bombs on japan.
b. provide economic aid to europe.
c. fight the spread of communism.
d. build a wall in berlin.

it made them more prductive and efficent but with the change of polcies less and les got into the navy

question as stated in comment

why did the chinese require the portuguese to pay for goods in gold and silver when trading?

choices

portuguese goods were less valuable than chinese goods.

the chinese already had a surplus of portuguese goods.

the imperial government wanted to stockpile gold and silver.

portuguese and chinese currencies were not exchangeable.

this a history q n in ancient time, theres no money exchange. so ans is portuguese and chinese currencies were not exchangeable.