Sarah Is a Teenager Who Presents as Very Depressed

Sarah is a teenager who presents as very depressed. When you ask her how long she has felt the same way, she says, "It comes and goes." She tells you that she first noticed it when she was nine. Before making a diagnosis, what will you need to examine?

A) How long the depressive symptoms normally last
B) What helps Sarah out of her depression
C) How many of her friends think she's making it up
D) How committed she is to changing