The correct answer is option 3: Soil & Water. Spraying DDT on crops can lead to pollution of both soil and water. DDT is a harmful chemical that can persist in the environment for a long time. When it is sprayed on crops, it can seep into the soil and contaminate it. This can have detrimental effects on the soil quality, affecting the growth of plants and the overall ecosystem. Additionally, DDT can also runoff from the fields during rainfall or irrigation and enter water bodies such as rivers, lakes, and streams. This can result in water pollution, posing a threat to aquatic organisms and potentially affecting human health if consumed through contaminated water sources. It is important to find alternative methods of pest control that do not have such harmful impacts on the environment.