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