Concept:Turpentine is the traditional solvent used to thin oil paint for smooth application.Explanation:Oil paint has an oil-based binder, so it cannot be mixed with water.Kerosene is not suitable for thinning paint for nursery furniture because it is oily and slow-drying.Turpentine is the correct solvent for mixing oil paint, as it thins the paint to the right consistency for brushing.Answer:C. Turpentine