Léon Walras' Late Nineteenth-Century Model of the Economy Consisted Of

Léon Walras' late nineteenth-century model of the economy consisted of:

A) a system of equations that represent the demand and supply sides of the many markets in which transactions simultaneously occur.
B) a small number of equations representing the aggregate behavior of a few groups.
C) a single equation linking total output to the principle inputs such as labor and capital.
D) a verbal explanation of how the distribution of income would become gradually less equal.