What's the logic behind the answer to this PYQ?

Question - The National Human Rights Commission of India is formed under which Article of the Constitution of India ?

(a) Article 21

(b)Article 32

(c) Article 356

(d) Article 377

[PYQ - Combined SO (Gr B) LDCE Year 2021 - 2022: Paper - I (For Year - 2021 - 2022)
~ Question No. 34 - Set A]

The Answer as per the official answer key is: Option A - Article 21.

But how, why, where is it written? or is this another case of just some random deductive logic has been used here by the UPSC ?