Step 1: Match the Constitutional Amendment Acts to their provisions. - (A) Hundred and First Constitutional Amendment Act → (1) Extension of reservation for SCs and STs in Union and State Legislatures - (B) Hundred and Second Constitutional Amendment Act → (III) Establishment of the National Commission for Backward Classes - (C) Hundred and Third Constitutional Amendment Act → (II) Provision for Reservation for Economically Weaker Sections - (D) Hundred and Fourth Constitutional Amendment Act → (IV) Implementation of the Goods and Services Tax