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 ethnopsychic research because the observer/analyst is able to pick up subtleties in the respondent's body language, speech patterns, and facial movements that are 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, it can effectively determine why they do it.
D) Personal observation is both useful and flexible, but has reliability issues when different observers watching the same event report different results.
E) With personal observation, different observers will reliably report the same conclusions when watching the same event, such as people brushing their teeth.