The correct option is B kerosene and water
Kerosene and water are immiscible liquids i.e. they don't mix well with each other and form separate layers. The rest of the pairs, alcohol and water; sugar and water; salt and water, all are miscible liquids i.e. they mix well with each other and form a homogenous solution. Separating funnel is used to separate immiscible liquids, thus only the mixture of kerosene and water can be separated using separating funnel.