The prevention of accidents makes it necessary not only that safety devices be used to guard exposed machinery but also that mechanics be instructed in safety rules which they must follow for their own protection, and that lighting in the plant be adequate.
The passage best supports the statement that industrial accidents:
Answer: D
Correct answer: can be eliminated with the help of safety rules
The passage is entirely about prevention, and every measure it lists - guarding exposed machinery, instructing mechanics, providing adequate lighting - is a safety rule of one kind or another. Its premise is therefore that accidents can be prevented if those rules are followed.
Options saying accidents cannot be entirely overcome or arise from ignorance or inadequate machinery contradict or go beyond that premise; the passage assigns no cause, only a remedy.
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