A milky liquid mixes freely with water, conducts electricity well, and a water-soluble dye colours it uniformly. The liquid is an emulsion of the type

Awater dispersed in oil (W/O)
Bgas dispersed in liquid
Csolid dispersed in liquid
Doil dispersed in water (O/W)

Answer: D

Free mixing with water, good conductivity and uniform colouring by a water-soluble dye all show that water is the continuous phase. Oil droplets are therefore dispersed in water, which is an O/W emulsion.

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