Final answer:
The absorbent material used to clean up a pesticide spill should be disposed of in a container marked as hazardous waste, following guidelines by the EPA to prevent environmental contamination.
Step-by-step explanation:
After using an absorbent material, such as kitty litter, to clean up a pesticide spill, the correct way to dispose of the material is to put it in a container marked as hazardous waste for later disposal. This is because pesticides are considered hazardous materials, and when they are absorbed by a substance like kitty litter, the resulting mixture also needs to be treated as hazardous waste. According to the Environmental Protection Agency (EPA), proper handling of hazardous waste is crucial to protect human health and the environment. Improper disposal can lead to contamination of soil and drinking water, and pose a significant risk to people and wildlife. Therefore, option C, "Putting it in a container marked as hazardous waste for later disposal," is the correct answer.