a. Audava-Sampurna raga: Saveri (ii) - 5 notes ascending, 7 descending.
b. Mela Raga (parent scale): Todi (iii).
c. Nishada varjya raga (without Nishada): Mohanam (iv).
d. Ghana raga: Goula (i) - a classical Ghana raga.
Hence, the correct answer is option (B).