The correct option is B Design safer chemical products and processes that reduce or eliminate the use and generation of hazardous substances.
The Principles of Green Chemistry
• It is better to reduce waste generation than to treat or clean up waste after it is generated.
• Wherever practically feasible, synthetic methodologies should be designed to use and generate substances that possess a little or no toxicity to humans and the environment.
• Chemical products should be designed to preserve efficacy of function while reducing toxicity.