The most important difference between the truman doctrine and the eisenhower doctrine demonstrated that
a. the united states wanted to increase economic aid to communist nations in eastern europe.
b. the policies of the united states had been successful in halting the spread of communism.
c. the united states later thought that military aid was needed in its fight against the spread of communism.
d. it was no longer necessary for the united states to send economic aid to countries threatened by communism.

c. the United States later thought that military aid was needed in its fight against the spread of communism.

Explanation:

The Truman Doctrine (1947) was a messure created by the U.S. for supporting free people who were resisting the atempts of armed minoritys or external pressures. These regimes were a threat to capitalism so the Truman Doctrine was created to fight against sovietic and comunist influence.

The Eisenhower Doctrine (1954) was a geo-strategic militar doctrine and a nuclear strategy by which if a Middle Eastern country was being threatened by armed aggression, it could request American economic assistance or aid from U.S. military forces.

C

Explanation:

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

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