Detailed Solution:

The correct answer is “Narayan Datt Tiwari”.

Nityanand Swami was the first Interim Chief Minister of Uttarakhand (then Uttaranchal), serving from 9 November 2000 to 29 October 2001.

He was succeeded by Bhagat Singh Koshyari, who also served in an interim capacity until March 2002.

The first elected Chief Minister of Uttarakhand was Narayan Datt Tiwari, who assumed office after the 2002 Assembly elections.