I took a quiz on this and i personally think it is A but check other resources hope this helped!
It is to practice and improve their skills.
As a artist myself I use a sketchbook to practice and get better. I hope this helps~
As a student who took art for 3 years ur work is decent however i would like to suggest if u made the drawing equally proportional meaning the bottom half of the body should be equally proportional to the top half. i believe u can do better so keep up the good work