One Main Disadvantage of Structured Observation Is

One main disadvantage of structured observation is

A) failure to follow similar procedures each time an observation is made may make it difficult for other observers to obtain similar results.
B) observations that are made using structured observation are made under conditions that are less natural than those imposed in the laboratory.
C) the degree of control in structured observations unduly constrains the flexibility needed by researchers.
D) the compromise between the passive nonintervention of naturalistic observation and the precise control of laboratory methods has not proven to be effective.