Which of These Is Probably the BEST Answer to the Question

Multiple Choice

Which of these is probably the BEST answer to the question, "Why has the rate of depression increased dramatically around the world in the past few generations?"

A) "I'm not sure."
B) "I'm not sure exactly why, but the fact that it has increased seems to support genetic explanations for mood disorders."
C) "I'm not sure exactly why, but the fact that it has increased seems to support environmental or . sociocultural explanations for mood disorders."
D) "The increase probably isn't real."