Praetorian wrote:
Professor Jones has claimed that chemical compound chlorocetin contained in industrial waste and previously considered harmless is in fact very dangerous. Jones has examined several areas with high concentration of chlorocetin and found that certain vital biological processes, such as photosynthesis, are slower in these areas than is usual for the inspected species. The professor says that although he failed to establish an exact mechanism by which chlorocetin hampers photosynthesis, his findings are sufficient to state that chlorocetin is a dangerous chemical affecting natural world. This conclusion, however, is unwarranted because all that professor Jones actually established is a mere correlation between the level of chlorocetin and the speed of photosynthesis - correlation that might not reflect any causal relationship between the factors.
The highlighted portions of the text perform which of the following functions in the argument?
A: the first is the position the author disagrees with while the second is the author's own position
B: the first contains the argument the author critiques while the second identifies a logical flaw in this argument
C: the first is an evidence in the argument the author disputes while the second is a statement supporting the author's own position
D: the first describes a phenomenon which weighs against the author's opinion while the second reasons in favour of this opinion
E: the first contains information that, if true, could overthrow the author's argument while the second discredits this information
OFFICIAL EXPLANATION
Analysis: There are two persons in the question: Professor Jones and the author. As one can see, the author does not agree to the argument by Professor Jones. “This conclusion, however, is unwarranted because … (
the second boldface) “. Therefore, the opinion of the author is very much at odds with the opinion of Professor Jones. Then, let’s take a look at the first
boldface “certain vital biological processes, such as photosynthesis, are slower in these areas than is usual for the inspected species”. This is result of a test or lab or discovery, so it is an evidence professor Jones used to back up his conclusion “Professor Jones has claimed that...”. Therefore, answer C is the correct choice.
Why is B incorrect? “The first contains the argument the author critiques” is incorrect, because the author does not agree with the evidence (the first
boldface), but only disagrees the conclusion (claim) made by Professor Jones. We can rule out A, D and E as they are unrelated. B states that ‘the first contains the argument the author critiques’. Nowhere in the passage does the author critique the argument; he merely attacks the conclusion that is based on the argument. Furthermore the first sentence is clearly evidence and not an argument in itself.