"the purpose of hazard-zone maps is to give accurate information on the type and frequency of volcanic eruptions and consequent volcanic and hydrologic processes that could impact a given area -- information vital to sound land-use planning." in a summary, which question does the sentence answer? a. who b. why c. when d. where

The most accurate answer for the question should be 'What' since the sentence seems to be discussing the purpose of hazard zone maps and its characteristics. However, in the given choices, the most plausible answer would be 'B. Why' because the nature of the sentence seems to answer the question 'Why the hard zone maps are important'.