Which of the Following Was NOT Discussed in the Textbook

Which of the following was NOT discussed in the textbook as an appropriate condition for the use of an observation study?

A) There is a short time interval between the beginning and end of the behavior to be observed.
B) The behavior must be amenable to physiological measurement.
C) The behavior is public and therefore readily observed.
D) The behavior is so automatic or repetitive that any personal recall on the respondent's part is likely to be faulty.
E) All of the above were discussed as appropriate conditions for an observation study.