请教一道逻辑题 - ChaseDream

The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive
tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the
higher its quality. The proportion of free oleic acid that an olive oil contains is an
accurate measure of the oil’s acidity.
If the statements above are all true, which of the following conclusions is best supported
by them?
A. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
B. The quality of an unrefined olive oil can be determined only by accurately
measuring its acidity.
C. If an unrefined olive oil is intermediate in acidity between two other unrefined
olive oils, it will also be intermediate between them in quality.
D. Free oleic acid is the only acid that unrefined olive oil contains.
E. People who judge the quality of unrefined olive oils actually judge those oils by
their acidity, which the judges can taste.

照你的推理，题目不是说free free oleic acid 越少，quality越高么？free oleic acid是acid的一种，那么quality高的就一定acid低。但是acid低不一定quality好？因为还有其他原因决定quality。