Concept:A separating funnel is used for separating immiscible liquids that form two distinct layers.
Explanation:A separating funnel works only when the two liquids do not mix with each other.
Water and vegetable oil are immiscible liquids.
When they are mixed, they form two separate layers because oil is lighter and floats on top of water.
The separating funnel can then be used to drain the lower layer of water and collect the upper layer of oil separately.
Sulphur and water form a solid-liquid mixture, so filtration is more appropriate, not a separating funnel.
Water and sodium chloride mix completely to form a salt solution, which requires evaporation or distillation for separation.
Vegetable oil and kerosene are miscible organic liquids, so they do not form separate layers and cannot be separated with a separating funnel.
Answer:D. Water and vegetable oil