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Verbal·Standard English Conventions·Boundaries

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In 1938, DuPont chemist Roy Plunkett opened a pressurized cylinder that should have contained tetrafluoroethylene gas and instead found a waxy white powder, a substance that, because of its imperviousness to heat, corrosion, and nearly all chemical        would eventually coat products as varied as frying pans and spacesuit fabrics.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

solvents;

B

solvents—

C

solvents,

D

solvents