The correct answer is (d). Potato.
Clonal selection is a technique used to produce a population of genetically identical cells or organisms. It is often used in agriculture to produce crops that are resistant to pests or diseases.
Potatoes are a good candidate for clonal selection because they are relatively easy to grow and they can be propagated vegetatively, meaning that new plants can be grown from cuttings of existing plants. This makes it possible to produce a large number of genetically identical potatoes in a short period of time.
Clonal selection can be used to produce potatoes that are resistant to a variety of pests and diseases. For example, potatoes that are resistant to the potato virus Y can be produced by selecting individual plants that are resistant to the virus and then propagating them vegetatively.
Clonal selection can also be used to produce potatoes with desirable traits, such as improved flavor or nutritional value. For example, potatoes that are high in antioxidants can be produced by selecting individual plants that are high in antioxidants and then propagating them vegetatively.
Clonal selection is a powerful tool that can be used to improve the quality and yield of potato crops. It is a safe and effective method that does not require the use of chemicals or genetic engineering.