Which of the following is a green alternative for dry cleaning solvents?

Step-by-step solution

Tetrachloroethene (perchloroethylene) was traditionally used as a solvent for dry cleaning. However, it contaminates groundwater and is a suspected carcinogen. To minimize environmental pollution and health hazards, green chemistry principles have led to the replacement of halogenated solvents with liquefied or supercritical CO ₂ along with a suitable detergent. Using supercritical CO ₂ is a greener alternative as it is non-toxic, non-flammable, and does not contaminate groundwater.