The author of the passage attempts to refute the legislators' argument by reasoning essentially as follows:Premise: Michelangelo's works portray nudity.Premise: Michelangelo's works are not considered obscene.
Intermediate Conclusion: A work of art that portrays nudity is not necessarily obscene.
Final Conclusion: The legislators are mistaken about why they should not provide funding for photographic art that portrays nudity.
However, the argument generalizes about whether portrayals of nudity are obscene by citing evidence about the works of only one particular artist. To generalize from this one particular case is to rely on certain unstated assumptions, one of which is that Michelangelo's portrayals of nudity are similar to modern photographic portrayals of nudity in all respects relevant to the argument. Thus, one way to effectively undermine the argument is to refute this unstated assumption.The first answer choice (we'll call it "A") is the second-best answer among the five choices. (A) suggests a possible explanation why modern photographers' works portraying nudity might be considered obscene while Michelangelo's works portraying nudity would not. But a better response would go further—to explain how artistic value affects whether an art work is considered obscene. Thus, while (A) tends to weaken the argument, you should look for another answer choice that refutes the argument's unstated assumption more directly.
The second answer choice (we'll call it "B") actually strengthens (supports) the argument, rather than weakening it. (B) provides some evidence, albeit weak, that Michelangelo's works are relevantly similar to those of modern photographers.
The third answer choice (we'll call it "C") is irrelevant to the argument, which relies on a logical connection between nudity and obscenity, not on any logical connection between federal funding and obscenity.
The fourth answer choice (we'll call it "D")fails to provide enough information to either weaken or support the argument. More specifically, (D) does not indicate how the general citizenry's view as to what is obscene compares with that of the legislators. Without this information, (D) accomplishes nothing toward either weakening or supporting the argument.
The fifth answer choice (we'll call it "E") is the best one. (E) directly refutes the unstated assumption that Michelangelo's works and those of modern photographers are similar in all respects relevant to the argument—by stating explicitly that Michelangelo's works are considered not obscene because of their relatively high artistic value.