mental ability

In a Class Vidhya ranks 7th from the top, Divya is 7 ranks ahead of Medha and 3 ranks behind Vidhya
Sushma who is 4th from the bottom, is 32 ranks behind Medha. How many students are there is the class ?
(A) 52 (B) 49 (C) 50 (D) None of these