Bunuel
Commentator: Human behavior cannot be fully understood without inquiring into nonphysical aspects of persons. As evidence of this, I submit the following: suppose that we had a complete scientific account of the physical aspects of some particular human action—every neurological, physiological, and environmental event involved. Even with all that we would obviously still not truly comprehend the action or know why it occurred.
Which one of the following most accurately describes a flaw in the argument’s reasoning?
(A) No support is offered for its conclusion other than an analogy that relates only superficially to the issue at hand.
(B) The purported evidence that it cites in support of its conclusion presumes that the conclusion is true.
(C) It concludes that a proposition must be true merely on the grounds that it has not been proven false.
(D) It fails to indicate whether the speaker is aware of any evidence that could undermine the conclusion.
(E) It presumes, without providing justification, that science can provide a complete account of any physical phenomenon.
EXPLANATION FROM Fox LSAT
The commentator’s conclusion is his first sentence. The rest of the argument pretends to support that conclusion, but does so extremely poorly. The last sentence seems to basically just restate the first sentence. I think this argument is circular, and it simply doesn’t hold water. You can’t use your conclusion as the only evidence to support that same conclusion. An example: “Hulk Hogan is the best pro wrestler because he is the best at pro wrestling.” Huh? This makes no sense.
The question asks us to identify a flaw in the argument, so I think “the argument is circular” or “the argument assumes its conclusion” would be a great answer.
A) I don't see an analogy here. And anyway, I don’t think “superficiality” is the real problem. I think it’s circularity. So I’m hoping one of the other answer choices will say that.
B) Boom. The argument assumes (or presumes, same thing) that its conclusion is true. That’s a circular argument.
C) This is certainly a flaw. Disproof of an argument does not prove the opposite of the argument’s conclusion. This would be the answer if the argument had said, “You haven’t proven God doesn’t exist, therefore God must exist.” But that’s not what the argument did.
D) What? No way. I don’t think this could ever be the answer, actually. I can make a logically valid argument without being required to acknowledge that I am aware of evidence that could undermine my conclusion.
E) The argument simply doesn’t do this.
Our answer is B