Which of the Following Would Be a Drawback to Running

Which of the following would be a drawback to running all members of the experimental group in a single morning session and all members of the control group in a single afternoon session?

A) one participant's responses may affect other participants' responses
B) differences between the control and experimental group might be due to time of day rather than to the treatment
C) chance differences between testing sessions would not have an opportunity to even out
D) all of the above