Faustus’s downfall is marked by

a) his increasingly dangerous use of the black arts
b) his increasing lack of regard for the value of human life
c) the declining social status of the people with whom he interacts
d) his increasing interest in using science to solve the problems of religion

Faustus's downfall is marked by A. his increasingly dangerous use of the black arts.
He sold his soul to the devil in order to gain all the knowledge in this world. He didn't want glory or riches, he only wanted to know absolutely everything there was to know in the world. The more he knew, the more he wanted, which is what led to his downfall. 

B Mary

Explanation: It makes it more clear that Mary brought it by herself.