请教Prep 2破解一题

17.   (26864-!-item-!-188;#058&003368)

At present the Hollywood Restaurant has only
standard-height tables.  However, many
customers come to watch the celebrities who frequent the Hollywood,
and they would prefer tall tables with stools because such seating would afford
a better view of the celebrities. 
Moreover, diners seated on stools typically do not stay as long as
diners seated at standard-height tables. 
Therefore, if the Hollywood replaced some
of its seating with high tables and stools, its profits would increase.

The argument is vulnerable to criticism on the
grounds that it gives reason to believe that it is likely that (D) (C)

(A) some celebrities come to the Hollywood
to be seen, and so might choose to sit at the tall tables if they were
available

(B) the price of meals ordered by celebrities
dining at the Hollywood compensates
for the longer time, if any, they spend lingering over their meals

(C) a customer of the Hollywood who would choose
to sit at a tall table would be an exception to the generalization about lingering (逗留，游荡)

(D) a restaurant's customers who spend less time
at their meals typically order less expensive meals than those who remain at
their meals longer

(E) with enough tall tables to accommodate all the
Hollywood's
customers interested in such seating, there would be no view except of other
tall tables

不理解为何选C？NN指点一下

C、那些选择高凳子的顾客，会是关于lingering(逗留)的例外。

首先，需要明确，问题是“Weaken”。原文里说，坐高凳子的顾客，一般不会像坐标准台子的顾客逗留那么久。（因此可以增加餐厅的顾客流通速度，从而增加盈利）；而C选项，如果这些选择高凳子的顾客要逗留很久了，那么自然就达不到起初的目的了。因此削弱了结论。