Which of the Following Is True

Multiple Choice

Which of the following is true?
I. A rational choice is made on the margin.
Ii. Microeconomics is the study of the national economy while macroeconomics is the study of the global economy.
Iii. Economists try to understand how the economic world works by testing normative statements.

A) i and ii
B) only ii
C) only iii
D) only i
E) i and iii