OFFICIAL EDXPLANATION

If most property values have dropped significantly, but some have risen slightly, a reassessment should occur (since values have changed at different rates) but is unlikely (since it will not benefit the government). Thus choice D describes the required situation and is the best answer.

According to the passage, choices A and E describe the situations in which there is no need for a reassessment, since change has occurred uniformly. Similarly, choices B and C both describe situations in which a reassessment should occur, and is likely to, since the government will benefit.