Sangeeta and Madhuri are ranked $$7^{th}$$ and $$11^{th}$$ respectively from the top in a class of 31 students. What will be their respective ranks from the bottom in the class?

A

$$20^{th}$$ and $$24^{th}$$

B

$$24^{th}$$ and $$20^{th}$$

C

$$25^{th}$$ and $$20^{th}$$

D

$$25^{th}$$ and $$21^{th}$$