The correct answer is: a) Compost
Compost is a mixture of organic materials that have decomposed over time. It is a rich source of nutrients and helps to improve soil structure, drainage, and water retention. Compost can be made from a variety of materials, including food scraps, yard waste, and manure.
Sand is a type of soil that is made up of small, loose particles of rock. It does not have a lot of nutrients and does not help to improve soil structure or water retention. Sand can be used to improve drainage in heavy clay soils.
Gravel is a type of soil that is made up of larger, more compacted particles of rock. It does not have a lot of nutrients and does not help to improve soil structure or water retention. Gravel can be
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