- AThe covers were paid for out of the mill's own funds and not from any grant
- BWorkers at the mill are examined by a doctor once every year
- CAir sampled at head height beside the frames showed the loose fibre it carried fall by two-thirds in the week the covers went on, and it is the breathing in of that fibre which brings on the cough in question
- DThe covers were made in the mill's own repair shed rather than bought in
Step-by-Step Solution
The officer asserts a link between a cover and a cough with nothing in between; the option supplies the missing middle, showing that the covers cut the airborne fibre and that this fibre is what causes the cough. With both steps in place the claim rests on a working chain rather than on coincidence. How the covers were funded and where they were made bear on cost and provenance, and a yearly medical examination was in place before and after alike.
Answer: C) Air sampled at head height beside the frames showed the loose fibre it carried fall by two-thirds in the week the covers went on, and it is the breathing in of that fibre which brings on the cough in question