Angela Reads About a Study in Which Cell Phone Use

Multiple Choice

Angela reads about a study in which cell phone use is associated with migraine headaches. She says, "Well, that study is not valid because I use a cell phone more than anyone I know and I never get migraines." Based on her comment, Angela may be forgetting which of the following?

A) Science is based on empiricism.
B) The study has been replicated.
C) The study did not properly define cell phone use.
D) Science is probabilistic.