D. All of the above. Developing medicine, analyzing compounds and producing new product such as plastic all have to deal with chemistry.
In descriptive investigations, we still haven't formed any hypothesis yet so we seek information by asking question.
It's not repeatable because repeating the questions over and over again without any clue about what we want to seek is completely waste of time.
Hope this helps xox :)
I believe the correct answer is C, but I'm 100% on this. Hope this helped though!
-TTL
