Answer: B) Mephistophilis as his servant.
Step-by-step explanation: In the novel "Faustus" by Goethe, we can see how Faustus makes a deal with the devil, he exchanges his soul for some wishes that the Devil granted him. Faustus wanted twenty-four more years of power and fame, more knowledge and wisdom and he also wanted Mephistophilis as his servant (Mephistophilis is the Devil), but from those wishes, he only obtained the first two, because the Devil didn't accept to be his servant.