Question type is ASSUMPTION. Tip #1: The argument has conclusion and premises. Tip#2: We have to negate answer choices to know the right one.
We have heard a good deal in recent years about the declining importance of the two major political parties. —->Background information.
It is the mass media, we are told, that decide the outcome of elections, not the power of the parties.——-> Fact again.
But it is worth noting that no independent or third-party candidate has won any important election in recent years (Why? Are they powerful?), and in the last nationwide campaign, the two major parties raised and spent more money than ever before in support of their candidates and platforms (Why? Is this influential on their acts?).——->Author's evidence (Keywords: worth noting, ever before)
It seems clear that reports of the imminent demise of the two-party system are premature at best.——->This is Conclusion.
(A) The amount of money raised and spent by a political party is one valid criterion for judging the influence of the party. ——>This ties the evidence to support the conclusion. If we negate this, Then it weakens the argument overall.
(B) A significant increase in the number of third-party candidates would be evidence of a decline in the importance of the two major parties.——>Ok, so what?! Lets negate this. Perhaps two or three other parties istead of one are attributing to the decline in the two. So OUT
(C) The two-party system has contributed significantly to the stability of the American political structure.—-> We don't care their path work. Perhaps better parties are emerging. So OUT
(D) The mass media tend to favor an independent or third-party candidate over a candidate from one of the two major parties. ——> If this true, what abut the second party? Partial approach.
(E) The mass media are relatively unimportant in deciding the outcome of most elections. —-> Ok, so What? Nothing changes in the argument.
Answer is A