Question: The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.

(A) what are called aperiodic tiles, turned out to describe
(B) what is called aperiodic tiles, describes
(C) aperiodic tiles, describing
(D) so-called aperiodic tiles, describe
(E) aperiodic tiles, it turned out to describe

Answer: A
Explanation:

The following arguments could be used to defend the suggested language change:

• Parallelism
• Considering two separate truths
• Modifiers

A: Correct
It is the correct answer. The use of the word “turned out” clearly portrays the meaning. Many people think about whether to use "what are called" or "what is called."
To choose between "turned out to describe/describes/describing/it turned out to describe," we should really work backward. Because each of the five responses has a distinct wording, we may determine the correct response by examining this section.
We first require "turned out" because we need to portray contrast or surprise.

B: Incorrect
This is an incorrect answer. The phrase implies that the description of crystal architecture in this study was not initially anticipated. We first require "turned out" because we need to portray contrast or surprise. Hence this choice can be eliminated.

C: Incorrect
This is an incorrect choice. The phrase implies that the description of crystal architecture in this study was not initially anticipated. We first require "turned out" because we need to portray contrast or surprise. Hence this choice can be eliminated.

D: Incorrect
It is an incorrect answer. The phrase implies that the description of crystal architecture in this study was not initially anticipated. We first require "turned out" because we need to portray contrast or surprise. Hence this choice can be eliminated.

E: Incorrect
It is an incorrect answer. Second, the text "it turned out to depict" can be found in the area of option E that comes after the comma.
It is unnecessary to use "it" in this context because "The work" is already the subject of the phrase. However, "it" does not have a clear antecedent. This choice can be eliminated.

“The work of mathematician Roger Penrose in the early 1970s, on the geo” - is a GMAT sentence correction question. The text that is underlined in these questions has grammatical mistakes, and we must select the right response from the list of possibilities. The GMAT verbal section includes GMAT sentence correction.

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