Which of the Following Would Be a Good Source for Research

Multiple Choice

Which of the following would be a good source for research ideas?

A) observing that in everyday life people do not behave the way a theory says they should
B) reading a study and thinking, "Hmm; they seem not to have taken X into account in testing their hypothesis."
C) reading a study and thinking, "Hmm; they say that A caused their results, but I think that it was really B."
D) all of the above