You will be able to know your strengths and weaknesses, you will be able to pick a career that you know you will do good at
The answer would be D. 30s (apex)
This actually depends on which level of education you are and what they are looking for. Most people though merely considers it a part of the Digestive System as the bile it stores is used during digestion.
I have seen however several people put it down as part of the bilary system or subsystem which responsible for the creation and distribution of bile.
I think it is housed in the Medulla Oblongata
