Bunuel
In the past year the National Broadcasting Network (NBN) has lost nearly 30 percent of its advertising revenue. Most of the advertisers who ended their association with NBN did so in the month following the network's broadcast of a controversial political program. Industry analysts believe that the controversial program led to NBN's loss of so much revenue.Each of the following, if true, provides additional support for the analysts' belief EXCEPT:(A) Many of the advertisers that left NBN have strong political positions and prefer not to financially support those who disagree with them.(B) Another network that broadcast the controversial program experienced a similar drop in advertising revenue.(C) Most of the drop in advertising revenue resulted from advertisers cutting down their number of advertisements, not ceasing to advertise completely.(D) Many of the advertisers who left NBN also advertise on competing networks, and these other networks did not experience drops in advertising revenue when NBN did.(E) The month following the broadcast of the controversial program is typically one in which networks experience an increase in advertising revenue. OFFICIAL EXPLANATION
C
This strengthen question has a passage with a clear argument based on causality. It claims that the controversial program led to advertisers ending their association with the network. In EXCEPT questions, remember that the correct answer might not be the opposite of a strengthen answer (a "weaken" answer); it might be an answer that has no effect.
Choice (A) strengthens the argument. If the advertisers have strong political opinions, that is one reason they might not want to support a network that broadcasts a controversial political program. (B) also strengthens the argument, as another network saw the same causal effect. Choice (C) does not strengthen the argument; the argument is based on revenue losses due to advertisers leaving, not advertisers reducing how much they advertise.
Choice (D) suggests that if the network hadn't broadcast the controversial program, it wouldn't have lost the revenue, which strengthens the argument. (E) strengthens the argument as well, by eliminating one possible alternative explanation for the loss in the revenue.
Choice (C) is correct.