Direct Object is the correct answer.
Because they're entertaining and they attempt to describe things we wonder about, so we're curious about them.
C. your last name and the page number.
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'.
C.) Name of researcher should not be included in a bibliography