Explanation
Why Correct: The Constitution of India establishes a quasi-federal system, a term coined by K.C. Wheare, combining features of both federal and unitary governments with a tilt toward the Centre. This is evident in the single Constitution, single citizenship, the Union's power to alter state boundaries, the appointment of the Governor by the President, and the supremacy of Parliament over state legislatures in certain matters.
Distractor Analysis: A completely federal system would grant states full autonomy and equal representation in the upper house, which India does not have. A completely unitary system would mean the states are mere administrative units with no constitutional existence, which is also not the case. States having more power than the Centre is contrary to the constitutional design, which concentrates more authority in the Union.
Takeaway: The quasi-federal nature is reinforced by the fact that the Constitution is the supreme law, but the Union Parliament can amend it with special procedures, and the President can impose President's Rule under Article 356, dissolving a state government. This dual character makes India a unique federal system.