What is the impact of studying economics according to the text?

The study of economics is not necessary to understand the reality of society.
The study of economics contributes to a better understanding of the social environment and the exercise of citizenship.
The study of economics is only important for those who want to work in the field of finance.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and III are correct.
e) II is correct.