How Is the Issue of the Dark Figure of Crime

How is the issue of the dark figure of crime addressed in data collection on US crimes?

A) Surveys can ask victims and offenders about crimes that may not have been reported to the police.
B) Federal agencies can prosecute any agency, city, or state, which intentionally underreports crime.
C) Researchers and journalists can file court cases to open up sealed records and reports.
D) Police can threaten to arrest people if they know of a crime and do not report it.