The correct answer is A) Unitary.
A unitary system of government is a political system in which a central government holds power and authority over regional or state governments. The central government may delegate some powers to regional or state governments, but it retains ultimate authority.
A federal system of government is a political system in which power is shared between a central government and regional or state governments. The central government and regional or state governments have their own powers and responsibilities, and each level of government is independent of the other.
A confederal system of government is a political system in which a group of independent states agree to cooperate on certain issues, but each state retains its own sovereignty. There is no central government, and each state has its own constitution and laws.
A presidential system of government is a political system in which the head of state is also the head of government. The president is elected by the people, and the president appoints a cabinet to help run the government.
Kerala is a state in India, and it follows a unitary system of government. The central government of India holds power and authority over the state government of Kerala. The central government may delegate some powers to the state government, but it retains ultimate authority.