【求助】无关到底怎么判断啊？

OG11紫皮71. 
Because postage rates are rising，Home Decorator magazine plans to maximize its profits by reducing by
one-half the number of issues it publishes each yean The quality of articles，the number of articles published
per year and the subscription price will not change．Market research shows that neither
subscribers nor advertisers will be lost if the magazine's plan is instituted．

Which of the following，if true，provides the strongest evidence
that the magazine's profits are likely to decline if the plan is instituted?

(A) 
With the new postage rates，a typical issue under the proposed plan would cost about one。third more to mail than a typical
current issue would．

(B)  The
majority of the magazine's subscribers are less concerned about a possible
reduction in the quantity of the magazine's articles than about a possible loss
of the current high quality of its articles．

(C)  Many
of the magazine's long-time subscribers would continue their subscriptions even
if the subscription price were increased．

(D)  Most
of the advertisers that purchase advertising space in the magazine will
continue to spend the same amount on advertising per issue as they have in the
past．

(E) 
Production costs for the magazine are expected to remain stable．

答案是D 看完OG 的解释后 也明白了 但是为什么在做题的时候 我第一眼看到advertisers就马上把该选项排除了

我想知道 在什么样的题型中 不能使用这样的无关词排除法呢