The correct options are
A It explains the powers of the leaders.
B It defines the ideals of the country.
C It tells whether the government is a democratic one or not.
D It provides guidelines on how to run the country.
The Constitution of India tells whether the government will be a democratic one or not. It explains the powers of leaders, and defines the ideals of a country. Therefore, writing the constitution of a country literally gives you the power to reshape the way it is run.