A magazine dedicated to promoting Dogri language and culture is:

Namaste Dogri
Duggar Sanskriti
Jammu Sandesh
Dogri Times

The correct answer is: a) Namaste Dogri.

Namaste Dogri is a monthly magazine dedicated to promoting the Dogri language and culture. It was founded in 2005 by a group of Dogri writers and intellectuals. The magazine publishes articles on a variety of topics related to Dogri, including language, literature, history, culture, and society. It also publishes poetry, short stories, and essays in Dogri.

Duggar Sanskriti is a quarterly magazine published by the Dogri Sansthan, Jammu. It publishes articles on a variety of topics related to Dogri culture, including language, literature, history, art, and music. It also publishes poetry, short stories, and essays in Dogri.

Jammu Sandesh is a daily newspaper published from Jammu. It does not have a special focus on Dogri language and culture.

Dogri Times is an online news portal that covers news from Jammu and Kashmir. It does not have a special focus on Dogri language and culture.