Melanie Has Lost a Significant Amount of Weight and Hasn't

Melanie has lost a significant amount of weight and hasn't been able to sleep since she broke up with her boyfriend a month ago.She feels guilty for not having spent enough time with him while they were together and is having difficulty thinking about anything else.She is still happy to go to dance class and her weekly pizza night with friends,but often finds that she's moving more slowly throughout her day.Her parents have observed that she also seems to be moving more slowly than before.Can Melanie be diagnosed with major depressive disorder?

A) Yes.
B) No, because it was triggered by a break-up.
C) No, because it hasn't persisted long enough.
D) No, because it's not clear that she has depressed mood or a loss of interest or pleasure in most activities.