the simplified expression is :- ((AY')B)'C = Y'
therefore,C=1 ,Y=1 can be deduct from the problem .
now the more simplified expression becomes :-
((A'+Y)B)' = 0
or,((A'+Y)'+B') = 0
or, AY'+B' = 0
therefore B should be 0 to get a 1 in the last or operation as Y is 1.therefore options (a) & (C) are correct.