Doctor faustus was loosely based off of which was about a conjurer who had supposedly sold his soul. a. a greek myth b. a german legend c. a confucius tale d. a shakespeare play

a German legend

Explanation:

It is well known that Doctor Faust actually lived in Germany in the first half of the XVI century. More precisely-he was a resident of Württemberg, as a single German state at that time was not on the political map of the world.  

Historical Faust was born in Knittlingen near Malulbronn. In The Maulbronn itself many years later, the "Tower of Faust" was intact, where he was engaged in science and magic and which the locals liked to show to tourists.