SO2 and CO2 both turn lime water (X) milky, SO2 also turns K2Cr2O7 /H+ (Y) green while O2 is soluble in pyrogallol (Z) turning it black. These gases are to be detected in order by using these reagents. The order is:
(A) (X), (Y), (Z)
(B) (Y), (Z), (X)
(C) (Y), (X), (Z)
(D) (X), (Z), (Y)
