The correct answer is (b), Gangadatt Upreti.
Gangadatt Upreti was born in 1893 in the village of Khirsu in the Kumaon region of Uttarakhand, India. He was a well-known poet, writer, and social reformer. He is best known for his poetry, which is often about the beauty of the Kumaon region and the struggles of the people who live there. He was also a prolific writer, and his works include novels, short stories, essays, and plays. He was a strong advocate for social reform, and his work often focused on the problems of poverty, illiteracy, and caste discrimination. He was a major figure in the Kumaoni Renaissance, and his work has had a lasting impact on the culture and literature of the Kumaon region.
The other options are incorrect.
(a) Lokratna Pant was a famous poet from Kumaun. However, his original name was not Gumani.
(c) Taradatt Pandey was a famous writer from Kumaun. However, his original name was not Gumani.
(d) Shivprasad Dabral is a famous writer from Kumaun. However, his original name was not Gumani.