Explanation
In this question and in all GMAT questions that ask about
the significance of details, we want to keep a sense of perspective. This
detail in line 25 is located in paragraph 2, and we have seen that paragraph 2,
throughout, is all about connecting the attributes of galaxies with events that
happened between these galaxies. So that, or something related to it, will be
the answer to this question. The stream of stars, the passage tells us, is
evidence that Triangulum/M33 and Andromeda/M31 interacted in the past. Answer
choice (A) is a more general statement of this idea, but a valid one. Choices
(B) and (C) take snippets from the rest of the paragraph that are not connected
to the stream of hydrogen and stars in question. Choices (D) and (E) introduce
new theses that are neither stated nor implied.
The correct answer is (A).
Passage 6
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