Which of the Following Is NOT a Problem Associated with Observational

Multiple Choice

Which of the following is NOT a problem associated with observational methods?

A) Reactivity may compromise validity.
B) People may change their behaviour if they know they are being observed or recorded.
C) Observers may begin to develop their own theories of behaviours mid-way through the observation.
D) Observer drift may occur.
E) Observation is expensive in terms of time and scoring procedures.