Much Research Has Demonstrated a Link Between Depression and Low

Multiple Choice

Much research has demonstrated a link between depression and low levels of the neurotransmitter serotonin. Therefore, one might speculate that, on average, people who are depressed ____. ​

A) may be more aggressive than other people
B) may be less aggressive than other people
C) may have higher testosterone levels than other people
D) may have lower testosterone levels than other people