Question #76.

Because ethylene dibromide, a chemical used to fumigate grain, was blamed for the high rate of
nerve damage suffered by people who work in grain-processing plants, many such plants switched to
other chemical fumigants two years ago. Since then, however, the percentage of workers at these
plants who were newly diagnosed with nerve damage has not dropped significantly. Therefore,
either ethylene dibromide was wrongly blamed or else the new chemicals also cause nerve damage.
Which of the following is an assumption on which the argument depends?
A. If the new chemicals cause nerve damage, the nerve damage caused would be different from
any nerve damage that ethylene dibromide may cause.
B. There are no chemical fumigants that are completely safe for workers in grainprocessing
plants.
C. If ethylene dibromide causes nerve damage, it does not take two years or longer for that
damage to become detectable.
D. Workers at grain-processing plants typically continue to work there even after being
diagnosed with nerve damage.
E. Workers at grain-processing plants that still use ethylene dibromide continue to have a high rate of nerve damagerate of nerve damage .

Answer sheet suggest the correct answer is option b , but look like option c  is  better.

Can you explain . . .