In a democratic society, when a political interest group exceeds a certain size, the diverse and sometimes conflicting economic interests that can be found in almost any large group of people tend to surface. Once these conflicting interests have surfaced, they can make it impossible for the political interest group to unite behind a common program. Yet to have the political impact necessary to influence legislation, a group must be united.The statements above, if true, most strongly support which one of the following views?The wording in the stem "most strongly support" indicates that this is Conclusion question. So, the correct answer will be the one for which there is clear support in the passage that we can point to.
(A) Political interest groups are generally less influential when their membership is expanding than when it is numerically stable.The passage says nothing about what happens when a group's membership is "expanding."
Rather, it says what happens at a point in time "when a political interest group exceeds a certain size."
So, since "expanding" and "exceeding a certain size" are different things, this choice is not supported.
Eliminate.
(B) For a democratic society to function effectively, it is necessary for political groups within that society to make compromises with each other.The passage doesn't say anything about multiple "groups" compromising.
Rather, the information is all about what occurs when one "group" exceeds a certain size and consequently cannot unite behind a common program.
Eliminate.
(C) Politicians can ignore with impunity the economic interests of very large groups of people.The passage doesn't say anything that indicates that politicians can completely "ignore" the economic interests of "very large groups" in general.
Rather, the point is that, when political interest groups in particular exceed a certain size, they cannot "influence legislation."
Eliminate.
(D) A political interest group can become ineffective by expanding to include as wide a membership as possible.This choice follows logically from what the passage says.
After all, if it's true that "when a political interest group exceeds a certain size, ... conflicting economic interests ... surface," that "Once these conflicting interests have surfaced, they can make it impossible for the ... group to unite," and that ''to influence legislation, a group must be united," then it makes sense that "A political interest group can become ineffective by expanding to include as wide a membership as possible."
After all, "expanding to include as wide a membership as possible" could result in a group's "exceeding a certain size" and thus becoming unable to "unite behind a common program."
Thus, this choice is clearly supported by information in the passage that we can point to.
Keep.
(E) Political interest groups generally start out effectively but lose their effectiveness over time.The passage does not indicate what happens to political interest groups "generally" "over time."
Rather, the information provided indicates what happens in specific cases in which "a political interest group exceeds a certain size."
So, this choice is not supported.
Eliminate.
Correct answer: D