Which can preserve food stuff?

Answer: Option D

Sugar and vinegar, Salt and sugar and Vinegar can preserve food stuff.
Vinegar may be used to pickle food, a preservation method that extends the shelf life of perishable foods by killing bacteria. Pickling involves soaking a food in a brine solution made from vinegar, water, salt, and sugar, which also changes the food's flavor.
Use of salt and sugar curing to prevent microbial growth. Sugar as a preservative by acting as a humectant (maintaining and stabilising the water content in foods) sugar helps to prevent or slow the growth of bacteria, moulds and yeast in food like jam and preserves.