When a system is taken from state $$i$$ to state $$f$$ along the path iaf, it is found that $$Q = 50$$ cal and $$W = 20$$ cal.
Along the path 'ibf' $$Q = 36$$ cal. W along the path ibf is

A

6 cal

B

16 cal.

C

66 cal.

D

14 cal.