Select the correct option:
Her analysis was __ than impressive; it was nearly revelatory.

The correct option is more.

Explanation:

The sentence requires an adjectival modifier that creates an emphatic comparison: "Her analysis was more than impressive; it was nearly revelatory."

The phrase "more than [adjective]" is an idiom used to emphasize that a quality goes beyond mere description. Saying an analysis is "more than impressive" means its quality transcends being merely impressive, which logically aligns with the second clause stating it was "nearly revelatory."

Evaluating the choices:
1. more: Correct. Completes the idiom "more than impressive" to show that the analysis exceeded expectations.
2. less: Incorrect. "Less than impressive" means disappointing or subpar, which contradicts "nearly revelatory."
3. other: Incorrect. "Other than impressive" is ungrammatical in this context.
4. rather: Incorrect. "Rather than impressive" does not fit structurally with the subsequent phrase.