Step 1: Understanding Section 3 of the Commission of Inquiry Act, 1952.
Section 3 of the Commission of Inquiry Act, 1952, grants the power to the Central Government or a State Government to appoint an inquiry commission to investigate matters of public importance.
Step 2: Explanation of Other Options.
- (b) Union Public Service Commission and (c) State Public Service Commission do not have the authority to appoint an Inquiry Commission under this Act.
- (d) The Supreme Court does not appoint inquiry commissions under this Act.
Step 3: Conclusion.
The correct authority to appoint an inquiry commission is the Central or State Government, making (a) the correct answer.