The Sikkim Herald, an important publication during the time of the Chogyal (king), was primarily in the language of:

Nepali
Bhutia
English
Hindi

The correct answer is: c) English.

The Sikkim Herald was a weekly English-language newspaper published in Gangtok, Sikkim, India. It was founded in 1948 by Tashi Tsering, a Sikkimese journalist and politician. The newspaper was the first English-language newspaper to be published in Sikkim. It was also the first newspaper to be published in the state after it became a part of India in 1975. The Sikkim Herald ceased publication in 2007.

The Sikkim Herald was an important publication during the time of the Chogyal (king). It was a source of news and information for the people of Sikkim. The newspaper also played a role in the political development of the state. The Sikkim Herald was a critical voice of the people of Sikkim during the time of the Chogyal. The newspaper was also a strong advocate for democracy and human rights in Sikkim.

The other options are incorrect because they are not the languages in which the Sikkim Herald was published. Nepali is a language spoken in Nepal and India. Bhutia is a language spoken in Sikkim and Bhutan. Hindi is a language spoken in India.