The correct answer is (b), Garhwali.
Garhwali is a Pahari language spoken in the Garhwal region of Uttarakhand, India. It is one of the official languages of Uttarakhand, along with Hindi and English. Garhwali is spoken by about 5 million people.
Kumauni is another Pahari language spoken in the Kumaon region of Uttarakhand. It is also one of the official languages of Uttarakhand. Kumauni is spoken by about 4 million people.
Sanskrit is an ancient language that is no longer spoken as a mother tongue by any large population. It is, however, the liturgical language of Hinduism and Jainism, and is used in religious ceremonies and texts. Sanskrit is also studied by scholars around the world.
Jaunsari is a Pahari language spoken in the Jaunsar-Bawar region of Uttarakhand. It is not an official language of Uttarakhand. Jaunsari is spoken by about 1 million people.