Q7 - Scientists are sometimes said

[unprocessed1]

D and E are clearly wrong, as is A.

But what B and C actually mean is difficult to tell because of the abstract language (I had it down to B and C but incorrectly chose C).

B doesn't seem like it's a complete answer, and C is confusing because it's not clear what a second statement is.

Can anyone clarify what these answer choices actually mean? Help is much appreciated!

[ManhattanPrepLSAT1]

You're in exactly the right place. Now, when you're down to two look for reasons to dismiss one of the two answer choices, rather than look for reasons to choose one of the two answer choices.

(A) is wrong when it claims that the statement is designed to mislead.
(B) is correct. The implausible consequences would be the assumption that the substance is both safe and not safe - which is a claim that would result from the characterization of the scientists in the first sentence.
(C) says that the two statements contradict each other. What's the second statement that is taken to be true that contradicts the characterization of the scientists? There isn't one! We're simply told that the characterization would lead to a result that is contradictory, but the characterization is never contradicted by a second statement.
(D) is wrong when it says that the statement is shown to be uninformative.
(E) is wrong when it says that the statement is shown to be uninformative.

The key on this one is that they want you to have the word contradiction in your mind. They plant it there in the stimulus, and then they're careful to introduce the word in the incorrect choice, but not in the correct choice. Be careful on the language.