Vipul and Preeti are ranked seventh and eleventh. respectively from the top in a class of 31 students. What will be their respective ranks from the bottom in the class?

A

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

B

$$28^{th}$$ and $$29^{th}$$

C

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

D

$$26^{th}$$ and $$20^{th}$$