TCE, trichloroethene, and PCE, perchloroethene, are common pollutants in well water because...?

...they have been used extensively for commercial
applications such as dry-cleaning and degreasing and because_____?

A:they are extremely soluble in water
B:it was believed that they were harmless
C:they were used as fire retardants when putting out house fires
D:they are very stable (unreactive) molecules
2 answers 2