Betty Believes That It Is Best to Take the Casual

Betty believes that it is best to take the casual or common sense approach to reading others. She needs to remember that ________.

A) the casual approach is nonsensical, and should be avoided as much as possible
B) the systematic approach and the casual approach are one and the same
C) laboratory experiments on human behaviour often result in unreliable findings
D) the casual or common sense approach to reading others can often lead to erroneous predictions
E) behaviour is unpredictable, hence there is no accurate way to analyze it