Step 1: Concept Green chemistry focuses on using safer solvents to minimize environmental impact.
Step 2: Meaning Halogenated solvents like chloroform and carbon tetrachloride are toxic and pollute the air/water.
Step 3: Analysis Water is non-toxic, non-flammable, abundant, and does not contribute to air pollution compared to organic volatile compounds.
Step 4: Conclusion Water is the most environmentally friendly solvent among the choices.
Final Answer: (D)