Discussion

Explanation:

According to the fifth paragraph, the fourth and the most distant quasar is different from ordinary quasars and unlike the other quasars is shrouded in hydrogen gas. The other quasars are not shrouded in hydrogen gas. That rules out options 2 and 3.
Astronomers have been looking at the fog around the quasars since 1965 and not the quasar. Therefore, option 4 is eliminated.
The author mentions the telescopes and says, “The twin Keck telescopes in Hawaii are the world’s largest, and can therefore collect the most light.” Since distant quasars are faint, it is implied that big, powerful, telescopes would be required to spot them.
Hence, the correct answer is option 1.

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