Correct Answer: B

Your Answer:

Explanation

B

In this Rules question, commas and the words which and that are changing in the answers, which suggests that the question is testing the construction of describing phrases. The first part of the sentence says She combined two forms of spectroscopy into this new method, which is an independent clause. The second part of the sentence says led to the detection of a novel reaction pathway on the superficial level of titanium dioxide. The second part of the sentence is a describing phrase and needs to be properly constructed. Eliminate any answer that doesn't properly construct the describing phrase.

• (A) and (D) are wrong because led is missing a subject.

• (B) is correct because which is the subject of led and properly constructs a describing phrase.

• (C) is wrong because a phrase starting with "that" is Specifying and never follows a comma.