Which of the Following About Observational Forms Is FALSE

Which of the following about observational forms is FALSE?

A) When using observational forms, interviewer/observer bias may still be a problem.
B) When constructing an observational form, it is best to loosely define what is to be observed so the observer is free to react to each individual situation.
C) One of the most critical things in designing an observational form is to determine which aspects of the behavior are relevant.
D) A paper-and-pencil observation form assessing purchasing behavior should parallel the logical sequence of the purchase act.
E) All of the above are true.