Princeton CAT -- one more

A company is testing machines that construct folding chairs. Some of the chairs produced by the machines have faulty alignments that may cause the chairs to collapse. Some of the chairs produced by the machines are constructed with their join-pins attached too loosely, which may also cause the chairs to collapse, unless the pins are tightened. To produce the best chairs in the most efficient manner, the company should use the machine with the lowest proportion of chairs with faulty alignments.

Which of the following, if true, most strengthen the above argument?

A. The company has never produced folding chairs before, and hence has no relevant manufactureing experience.

B. The machine that produced the highest propertion of chairs with faulty alignments produced chairs of higher quality than did the other machines.

C. When planning for the construction and sale of chairs, it is necessary to consider the rate of production.

D. Some machines produce chairs with defects other than faulty alignments or loose join-pins.

E. All of the machines produced the same proportion of chairs with loose pins.

Answer: E.

对  B 的解释不懂， 怎么会 weaken  呢？请 示。谢了。

"No. This could weaken the argument."

B. The machine that produced the highest propertion of chairs with faulty alignments produced chairs of higher quality than did the other machines.

To produce the best chairs in the most efficient manner, the company should use the machine with the lowest proportion of chairs with faulty alignments.

in order to produce the best chairs in the "most efficient manner", the company should use the machine with the lowest proportion of chairs with faulty alignments; IF "the most efficient manner" is referring to higher quality then this could weaken the argument, since machinese pruduce chairs in "the most efficient manner" produce the highest proportion of faulty chairs and they won't be used

明白了。 谢谢Tiger.

原文结论：the company should use the machine with the lowest proportion of chairs with faulty alignments.

B 的论述：The machine that produced the highest propertion of chairs with faulty alignments

所以是 weaken

另 B 有无关嫌疑，quality 无关.