From which two theorists did alfred marshall borrow the concept of the importance of cost to the supply of goods?

a)adam smith and david ricardo
b)léon walras and william stanley jevons
c)david ricardo and léon walras
d)anton menger and adam smith

Option A.

Explanation:

Adam Smith and David Ricardo, is the right answer.

Alfred Marshall is regarded as one of the best economists of his age. He is one who was involved in the founding of one of the most influential School of Economics known as the Neoclassical School.   Although his economics was promoted as additions and distillations of the practice of Adam Smith, David Ricardo and some others, he prolonged economics away from its classical locus on the market economy and rather generalized it as a study of human behavior.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.