Ghana ragas are foundational in Carnatic music, characterized by their robust and stately quality. Keeravani is recognized as a Ghana raga.
Explanation of Other Options:
(A) Todi: While a melakarta raga, it is not categorized as a Ghana raga.
(B) Goula: This is a janya raga and is not traditionally included in the list of Ghana ragas.
(D) Mohanam: An audava raga, it is not a Ghana raga.
Therefore, the correct choice is option (C).