Over the Past Couple of Decades, the Correlation Between Number

Over the past couple of decades, the correlation between number of antidepressant prescriptions and younger patient suicide rates has been:

A) nonexistent.
B) positive; as the number of antidepressant prescriptions increases, so does the younger patient suicide rate.
C) negative; as the number of antidepressant prescriptions increases, the younger patient suicide rate decreases.
D) first negative (in the 1990s) , then positive (in the twenty-first century) .