This is evaluation question, my approach is
"variation technique" that is presented in Power Score CR - Bible.
The question stem is quite convoluted, but we can paraphrase it like "
which of the following statement can be used to evaluate the measure of machine efficiency?"
The basic idea of "variation technique" is adding YES/NO to each answer. If YES/NO does not change anything ==> The answer is wrong. But if YES/NO can change the part you want to evaluate ==> The answer is correct.KEY point is
"QUALITY", so stick to the options that mention quality.
ANALYZE EACH ANSWER(A)Producing cartridge cases is
THE PRIMARY PURPOSE / NOT THE PRIMARY PURPOSE of the machine discussed in the passage.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> A is wrong.
(B)The number of cartridge cases produced in a certain amount of time by a cartridge case machine is
RELEVANT / NOT RELEVANT to determining machine’s efficiency.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> B is wrong
(C)Machines producing cartridge cases are
REPRESENTATIVE / NOT REPRESENTATIVE of all other machines.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> C is wrong
(D)
The quality of the product produced
CAN BE IGNORED / CANNOT BE IGNORED when determining the time efficiency of a certain machine.
If the quality can be ignored ==> the more products, the more efficiency
If the quality must be considered ==> the more products does not mean the more efficiency, cause we have to consider how many defects.
D is correct.(E)The quality of the product
MAY DECREASE / MAY NOT DECREASE when the quantity of the product produced in a certain amount of time increases.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> E is wrong
Hope it helps.