Which of the following statements is true about psychology?

A) It has traditionally focused on altering attitudes.
B) It has traditionally focused on increasing insight and self-understanding.
C) It has traditionally focused on reducing or eliminating self-defeating thinking and behaviors.
D) All of these answers are correct.

Psychology encompasses a broad range of focuses, including altering attitudes, increasing insight and self-understanding, and reducing or eliminating self-defeating thinking and behaviors. These aspects are integral to various psychological theories and therapeutic approaches, making all the statements correct in the context of the field's traditional focuses.