Question: Astronomers studying the newly discovered star say that it provides clues about our galaxy’s origin, that it may supply data about how fast our galaxy is expanding, and moreover it is perhaps the most distant star in the entire Milky Way.

(A) about how fast our galaxy is expanding, and moreover it is perhaps
(B) regarding the speed our galaxy expands at; moreover, they think it may be
(C) about how fast our galaxy expands and perhaps be
(D) on the galaxy’s expansion rate and perhaps
(E) about how fast our galaxy is expanding, and that it is perhaps

Correct Answer: E
Explanation: About how fast our galaxy is expanding, and that it is perhaps- Correct. This is the most correct and maintains the parallelism. Present continuous tense is used and no new errors are introduced. Subject (astronomers), verb (say) and 3 clauses that begin with "that ''. "About" here is an object of "clues'' in the first that-clause and "data" in the second that-clause. Astronomers studying the newly discovered star say that it provides clues about our galaxy’s origin. That it may supply data about how fast our galaxy is expanding, and that it is perhaps the most distant star in the entire Milky Way. Let’s take a look at the other choices.

Option A
about how fast our galaxy is expanding, and moreover it is perhaps.- Incorrect. Parallelism issue. "Astronomers...say that it X, that it Y and that it Z" should be the correct structure.

Option B
regarding the speed our galaxy expands at; moreover, they think it may be. Incorrect. Parallelism issue as (A). Additionally, when talking about an ongoing event such as our galaxy's expansion. Present continuous tense ("expanding") is the correct usage and not simple present tense ("expands").

Option C
about how fast our galaxy expands and perhaps be.- Incorrect. The two problems in (B) are repeated

Option D
on the galaxy’s expansion rate and perhaps. Incorrect. Same parallelism issue as (A).

“Astronomers studying the newly discovered star say that it provides”- is a GMAT sentence correction question. These sorts of questions come up with grammatical errors in the underlined part of the sentence. The candidates need to select the correct statement given in the options. The GMAT sentence correction section demands good skills in grammar since the candidate has to identify common grammatical errors. GMAT sentence correction is a part of GMAT verbal.

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