Joseph took a class in macroeconomics, which means that he was studying the behavior of

Joseph took a class in​ macroeconomics, which means that he was studying the behavior of​ the overall economy.

Macroeconomics is a branch of economics. It deals with  indicators such as GDP, unemployment rates, national income and price indices.

Microeconmics on the other hand studies individuals and business decisions.

i would say b probably

answer; /// i believe that the correct answer is(cognitive revolution);