A bill passed by both Houses of Parliament becomes a law only after the President's assent, as per Article 111 of the Constitution.
Option A: Both Houses of Parliament approve it by requisite majority – Necessary step, but not sufficient.
Option B: The Council of Ministers approves it – Not part of the formal legislative process.
Option C: The President gives his assent – Correct; this is the final step for enactment.
Option D: The Supreme Court upholds its constitutional validity – Applies only if the law is challenged.