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This sentence seems to be saying illogically that the goal is to reduce the guests themselves, instead of to reduce the number of guests who express dissatisfaction or to reduce the expressions of dissatisfaction. End up has no meaningful role in the sentence and is

somewhat misleading. End up expressing suggests that the expression comes as the

culmination of a process whose outcome has been uncertain, perhaps as the result of the guests deliberating and changing their minds. Most likely, the goal is to reduce the number of guests who express dissatisfaction, not merely the number of those who end up doing so.

A.Reducing the guests should be changed to reducing the number of guests or reducing the expressions of dissatisfaction. As explained above, end up is superfluous and misleading.

B.As explained above, end up is superfluous and misleading. Also, a minor consideration is that the goal to (infinitive) is less standard than the goal of (participle) and might be jarring to some readers.

C.With the hotel service appears illogically to modify the guests. This modifier should be placed next to dissatisfaction. Also, ultimately with the goal seems to indicate that the commission does not yet have the goal but that it ultimately will have. The more likely intended meaning would be better expressed as with the ultimate goal. In general,

direct modifiers should not be separated from the word they modify, if possible.

D.The relative clause that ends up . . . modifies the plural guests (not, in this context,

number), so the correct verb form is end up. Furthermore, end up is superfluous and misleading.

E.Correct. The with phrase is concise, and it is the number of guests, not the guests

themselves, that is to be reduced. With the hotel’s service is adjacent to dissatisfaction. Also, in the relative clause starting with who, the implicit subject of express is guests, so this verb correctly agrees with its subject.

The correct answer is E.