What is not a purpose of a constitution?
a. to set ideals that people believe and share in
c. to be used as the supreme law of a land
b. to set the basic structure of the government
d. to give aid to other countries

Constitutions are basic documents which determine how a country will work: they set the rules and structure of the government and they can also enumerate the ideas that lead the people.

However, constitutions are limited to one country and don't involve other countries: the correct answer is d. To give aid to other countries