The Ferguson Protest in Ferguson, Missouri, Was in Response to a Police

The Ferguson protest in Ferguson, Missouri, was in response to a police officer killing a Black teenager; people gathered at the site over a two-week period to protest and memorialize the victim. Police attempted to disperse the gathering, leading to increased intensity of the conflict. In this instance of collective behavior, which of the following could be a problem in gathering evidence?

A) Researchers would not have enough time to collect evidence because the gathering lasted for such a short period of time.
B) There would be a lack of videos and news footage of the event.
C) There would be an overabundance of primary source data and overly objective data such as news reports, retrospective accounts, and interviews to sift through.
D) Even though researchers would have had enough time to observe the event in person because the protest lasted for two weeks, the event was dangerous enough that it might have kept potential researchers away.