The correct answer to this question is reliable which is the adjective. An adjective is a descriptive word used to describe objects, nouns, people and things.
I bought a car from a reliable salesperson.
Reliable is the adjective because it is describing the salesperson in this sentence.
I think it would be the third one "the process of communication is distinct for everyone"
because the term idiosyncratic basically means "to one self"
To be honest they all are great choices but personally I would suggest answer C.
Hope this helps.
What is the questions and yes I have read the story. I'm just confused on what you are asking.
