Automobile manufacturer: Recently developed defect-detection systems

Automobile manufacturer: Recently developed defect-detection systems, although not yet proven to be completely accurate, should be purchased immediately for our plants. Automated inspections will help assembly-line workers detect flaws in materials.

Employee representative: Plants will not benefit from inadequately tested defect-detection systems. Failures in those systems could mislead the workers using them, allowing flaws to go undetected.

Which of the following, if true, would most strengthen the employee representative's objection?

A)Any automated system, no matter how rigorously tested, is susceptible to malfunction.

B) An automated packing system was successfully introduced by the manufacturer with only minimal testing.

C)Even though the new system will help detect some flaws, the probable system failures will cause even more flaws to go undetected.

D)Many flaws are missed due to the high stress levels experienced by assembly-line workers.

E) Defect-detection systems as they are currently used are more effective at detecting flaws in finished products than they are in raw materials.

I find "D" strengthens more, the first statement mentions about assembly line workers..to detect flaws..hence if they already miss out on flaws, the new system will fail.