Official ExplanationFrom a trade exchange of artists from ancient Crete, people in other countries learned a method
that artists are able to use painting pigment into wet plaster for extending the durability of murals, now known as fresco.
A. that artists are able to use painting pigment into wet plaster for extending the durability of muralsB. that artists could use to extend the durability of murals by painting pigment into wet plasterC. for artists who could use painting pigment into wet plaster to extend the durability of muralsD. for the durability of murals to be extended by artists painting pigment into wet plasterE. of artists able to extend with painting pigment into wet plaster the durability of muralsAfter a quick glance over the options, there are several differences in how these are organized and worded. This means we may have to look for “larger” grammatical issues, such as modifier agreement, organization, and clear meaning. However, there are a few places we can focus on to narrow down our options before getting into the larger issues:
1. that artists / for artists / by artists / of artists (Active/Passive Voice; Meaning)
2. are able to use / could use / able (Verb Tense)
3. for extending / to extend / to be extended (Verb Choice) Let’s start with #1 on our list because it should be a pretty easy grammar issue to tackle: active vs. passive voice. We need to make sure that the person/thing DOING the action is first, and the actions they perform come after. It’s also a good idea to check that the phrases “that/for/of/by artists” make logical sense for the overall intended meaning:
A.
that artists are able to use painting pigment into wet plaster for extending the durability of murals =
OKAY (puts focus on the artists doing the actions)B.
that artists could use to extend the durability of murals by painting pigment into wet plaster =
OKAY (puts focus on the artists doing the actions)C.
for artists who could use painting pigment into wet plaster to extend the durability of murals =
OKAY (puts focus on the artists doing the actions)D.
for the durability of murals to be extended
by artists painting pigment into wet plaster =
WRONG (the artists are pushed between the two “action” phrases, making this passive voice)E.
of artists able to extend with painting pigment into wet plaster the durability of murals =
WRONG (While the artists are put first here, the phrase “method of artists” doesn’t make sense – artists are not the method here. The artists also don’t own the method, so using “of artists” just doesn’t work.)We can eliminate options D & E because they’re either in passive voice or the phrasing doesn’t make sense. Now that we have it narrowed down to 3 options, let’s look more carefully at the overall organization and meaning of each one. To make problems easier to spot, let’s also add in a bit of the non-underlined portion:
A. …people in other countries learned a method
that artists are able to use painting pigment into wet plaster for extending the durability of muralsThis is
INCORRECT for a couple of reasons. First, the phrase “are able to use” sounds clunky and awkward here. It sounds a bit like a run-on sentence, instead of a modifier. Second, the GMAT does NOT like using the combination “for verb+ing” whenever possible. So let’s rule this out.
B. …people in other countries learned a method
that artists could use to extend the durability of murals by painting pigment into wet plasterThis is our
CORRECT option! The meaning is clear and concise, it uses active voice, and it eliminates the “for verb+ing” issue in option A!
C. …people in other countries learned a method
for artists who could use painting pigment into wet plaster to extend the durability of muralsThis is
INCORRECT because it changes the intended meaning! Adding in that extra “who” changes the meaning from “any artists can use this method” to “ONLY artists who could use painting pigment can use this method.”
There you have it – option B is our winner! Don’t study for the GMAT. Train for it.