You looked exhausted. I think you’ve ______ more than you can handle.
A. turned on B. taken up C. turned up D. taken on
When I look them up in Oxford Dictionary, I rule out A and C but I am confused between B and D.
Take up st means beginning or starting st such as a job
Take on sb/st means deciding to do st or being agree to be responsible for sb/st
Which one is the best appropriate in this situation? and What is the difference between take on and take up?