Which of the Following Statements Concerning Personal Observation Is Most

Which of the following statements concerning personal observation is most accurate?

A) Personal observation is more accurate than forms of research because the observer/analyst is able to pick up on motivations for behavior often missed by other data collection methods.
B) Personal observation is especially suited for small businesses that need the research data but cannot afford more expensive data collection methods.
C) Personal observation is very effective since it can reveal not only what people do, but also effectively determine why they do it.
D) Personal observation is both useful and flexible, but has reliability issues if different observers watching the same event report different results.
E) With personal observation, different observers nearly always report the same conclusions when watching the same event, such as people brushing their teeth.