Option (D) in my opinion. I took 55 secs.
It's a split between (A) and (D).
The thing to note here is the subject of the sentence is not "depression", but "
the term "depression".
One thing to quickly check
if there is pronoun ambiguity is to
place the noun that the pronoun is seemingly referring to
into the place of the pronoun and to
check if it makes sense. And be unbiased to what sounds better.
(A) Although
the term "depression" is popularly applied to numerous episodes of sadness or a bad mood, in clinical psychology
the term "depression" is a serious and often disabling condition that significantly affects a person's work, family and school life, sleeping and eating habits and general health.
Here it illogical tries to imply that the "term- depression" is a serious condition. This does make any sense.
(D) Although
the term "depression" is popularly applied to numerous episodes of sadness or a bad mood, in clinical psychology
the term "depression" refers to a serious and often disabling condition that significantly affects a person's work, family and school life, sleeping and eating habits and general health.
This implies that the "term- depression" refers to a condition that is serious etc. This is logical and correct. Hence, the correct choice.