(Scenario I) Why Do You Think the Researchers in Scenario

Multiple Choice

(Scenario I) Why do you think the researchers in Scenario I did not rely only on participants' behavioral diaries to assess mood and cognition?

A) The researchers are unable to control the diary entries, making interpretation difficult.
B) Participants could succumb to demand characteristics and simply write what they thought the researchers wanted to hear.
C) Quantitative measures must always accompany behavioral diaries to establish validity.
D) All of the above.