Limitations of the Observational Data Collection Method Include Which of the Following

Limitations of the observational data collection method include which of the following:

A) Behavior that the researcher observes in a specified segment of time is not always an accurate representation of typical behavior.
B) It is difficult to observe all behaviors that occur because observers tend to become distracted by the environment.
C) Observer interference may result in meanings being assigned to behaviors that differ from the meanings those being observed would assign to the same behavior.
D) Both a and c.