Ghana ragas are a set of fundamental ragas in Carnatic music known for their solid and majestic nature. Keeravani is considered one of the Ghana ragas.
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Explanation of Other Options:
(A) Todi: A melakarta raga but not classified as a Ghana raga.
(B) Goula: A janya raga, not traditionally listed among Ghana ragas.
(D) Mohanam: An audava raga, not a Ghana raga.
Hence, the correct answer is option (C).