Question

which of the following contains a vague pronoun reference?

they have discovered that sleep has more than just restorative functions. for example, it plays a significant role in strengthening and solidifying memories.

neuroscientists have discovered that sleep has more than just restorative functions. for example, it plays a significant role in strengthening and solidifying memories.

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Explanation:

A vague pronoun reference occurs when a pronoun (like "they") doesn't have a clear antecedent (the noun it refers to). In the first sentence, "They" is used without specifying who "they" are. In the second sentence, "Neuroscientists" is a clear antecedent for any subsequent pronouns (here, "it" refers to "sleep", which is also clear, but the first sentence's "They" is vague). So the first option has a vague pronoun reference.

Answer:

The first option: "They have discovered that sleep has more than just restorative functions. For example, it plays a significant role in strengthening and solidifying memories."