GATE Question of The Day - Digital Electronics

 For the circuit shown in the following figure I₀-I₃ are inputs to the 4:1 multiplexer R(MSB) and S are control bits?

The output Z can be represented by

            (A)        PQ + PS +        

            (B)        P + PQ + 

            (C)        + QR + PQRS +    

            (D)        PQ + PQR + PQS + 

_{i request my Friends to not guess but solve the challenge!}