In "depression the secret we share" , part b: which detail from the text best identifies the central idea of the text?

a
“i want to say that the treatments we have for depression are appalling. they're not very effective. they're extremely costly. they come with innumerable side effects.” ( paragraph 23)
b
“people think of depression as being just sadness. it's much, much too much sadness, much too much grief at far too slight a cause.” ( paragraph 25)
c
“they talk to me differently insofar as they start telling me about their experience, or their sister's experience, or their friend's experience. things are different because now i know that depression is the family secret that everyone has.” ( paragraph 32)
d
“i was struck by the fact that depression is broadly perceived to be a modern, western, middle-class thing, and i went to look at how it operated in a variety of other contexts,” ( paragraph 45)

C. “They talk to me differently insofar as they start telling me about their experience, or their sister's experience, or their friend's experience. Things are different because now I know that depression is the family secret that everyone has.” ( Paragraph 32)  

Explanation:

"Depression the Secret We Share" is a text written by Andrew Solomon.

The text written by Andrew Solomon is very striking and revealing. As he suffered from depression his accounts are very convincing, very strong and devastating. Solomon knew depression closely and knew how it worked, but he only had his own experience as a source, he wanted to know what depression was like for other people around the world.

For this reason, he decided to travel to many different countries around the world and interviewing people and asking about their experiences with depression. Solomon was impressed by all the different interpretations people had about depression and how it affected their lives. Part B of Solomon's account highlights these interviews and how solomon was impressed by people's accounts.

i also think the correct answer here would be b.

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.