The correct answer is C. Promotion of Malayalam language.
Sahithya Parishath is a non-profit organization that promotes the Malayalam language and literature. It was founded in 1904 by a group of writers and intellectuals, including Kumaran Asan, C. V. Raman Pillai, and P. K. Narayana Pillai. The organization has been instrumental in the development of Malayalam literature, and it continues to promote the language through various activities, such as the publication of books and journals, the organization of literary events, and the provision of scholarships and awards.
A. Publication of literary magazines: Sahitya Parishath does not publish literary magazines.
B. Welfare of journalists: Sahitya Parishath does not focus on the welfare of journalists.
D. Archives of old newspapers: Sahitya Parishath does not archive old newspapers.