The correct answer is (c) U.S.A.
The federal system of India was inspired by the Constitution of the United States of America. The Indian Constitution was adopted on 26 November 1949 and came into effect on 26 January 1950. It is the longest written constitution of any country in the world.
The Indian Constitution is based on the principle of federalism, which means that power is shared between the central government and the state governments. The central government has power over matters such as defense, foreign affairs, and currency. The state governments have power over matters such as education, health, and agriculture.
The Indian Constitution also provides for a system of checks and balances between the central government and the state governments. This means that no one branch of government can become too powerful.
The federal system of India has been successful in promoting unity and diversity in the country. It has also helped to protect the rights of the people.
The other options are incorrect because:
(a) Canada is a federal state, but its constitution was not the main inspiration for the Indian Constitution.
(b) The United Kingdom is a unitary state, which means that power is concentrated in the central government.
(c) Ireland is a unitary state.
(d) Ireland is a unitary state.