Discussion

Explanation:

Option 1 indicates the period before the Dark Age.
Option 3 is irrelevant in the present context.
Option 4, is not correct as nothing has been said about the universe heating up after the Big Bang.
In the second paragraph, the author says that the period is called the Dark Age because of two reasons. One, that the universe was poorly lit and the other that very little about that period is known to the astronomers. Therefore, option 2 conforms to the second reason.
Hence, the correct answer is option 2.

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