The correct answer is (c), Netwarh (Uttarkashi).
Duryodhan and Karan are worshipped in Netwarh, a village in Uttarkashi district of Uttarakhand. The village is located on the banks of the Alaknanda River, about 100 kilometers from the state capital, Dehradun.
The temple of Duryodhan and Karan is located on a hilltop in the village. The temple is said to have been built by the Pandavas, the heroes of the Mahabharata. The Pandavas are said to have worshipped Duryodhan and Karan in order to seek their forgiveness for killing them in the Kurukshetra War.
The temple is a popular pilgrimage destination for Hindus. Devotees from all over the country visit the temple to seek the blessings of Duryodhan and Karan.
The other options are incorrect.
(a) Almora is a city in the Kumaon region of Uttarakhand. There is no temple of Duryodhan and Karan in Almora.
(b) Champawat is a district in the Kumaon region of Uttarakhand. There is no temple of Duryodhan and Karan in Champawat.
(d) Srinagar is a city in the Garhwal region of Uttarakhand. There is no temple of Duryodhan and Karan in Srinagar.