Correct option is B
The correct answer is (b) Three-fourths majority.
• Under Article 279A, GST Council decisions require a three-fourths majority of weighted votes.
• The Centre has 1/3rd weight, while States together have 2/3rd weight.
Information Booster:
• GST was implemented on 1 July 2017.
• The GST Council is chaired by the Union Finance Minister.
• Article 279A was inserted by the 101st Constitutional Amendment Act, 2016.
• Decisions aim at cooperative federalism.
Additional Knowledge:
• GST subsumed multiple indirect taxes like VAT, Excise, and Service Tax.
• India follows a dual GST model.