Each of the following is supported by one or both of the passages EXCEPT:

sarahpretzel on June 17, 2019


Why not A? I cannot find support for (A) in the passage. The only time I could find clay being mentioned was on line 39, and even here I did not see support to believe clay would specifically be an important constituent of many, if not all, drilling muds

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Ravi on June 17, 2019


Happy to help. Let's look at (A).

(A) says, "Clay is an important constituent of many, if not all, drilling muds."

(A) is discussing the composition of drilling muds, and this topic is
discussed in the first paragraph of Passage A. Here, we find that the
author says that drilling muds are made up of bentonite and other
types of clays (lines 12 and 13), so (A) has support from the passage.
Thus, we can get rid of it since passage A mentions it.

Does this make sense? Let us know if you have any other questions!

griffincarlson on December 2, 2019

Why not e? Although passage b says "typically 30%", it doesn't say anything about that being the regulation

shunhe on January 3, 2020


Thanks for the question! I assume you're asking why (D) is incorrect and why (E) is correct based on the comment about "typically 30%." (D) is wrong because in passage B, we're told that a type of drilling oil (oil-based mud, or OBM) has 30% mineral oil in it. If OBM does have this high content, then presumably, the government has allowed the company to use oil that has this percentage (we can't just assume the company illegal uses the oil without the government's permission). In fact, we're told in line 35 that the uses of oils are "highly regulated." Thus, since the company's using the oil and government regulations dictate what oil the company can use, government regulations must allow drilling muds to contain 30% mineral oil. Otherwise, the company wouldn't be able to use OBM at all.

(E) is right because we can see that it is contradicted in lines 43-46 (recall that this is an EXCEPT question). Companies will recycle WBMs and then, over a period of hours, dump the entire batch into the sea. This means that the drilling mud isn't continuously discharged into the sea, but rather that it's discharged all at once. Hope this helps!