How do the Bedouin actions set the plot of the story in motion

This question is incomplete, here´s the complete question.  

Read The Keys of Destiny, by Neil Philip  (1994)

How do the Bedouin’s actions set the plot of the story in motion?

A. The Bedouin enslaves Hasan Abdallah, introducing misery and suffering in his  life by keeping Hasan Abdallah away from his family.

B. The Bedouin employs Hasan Abdallah, making it possible for him to obtain the  riches necessary to live comfortably.

C. The Bedouin enslaves Hasan Abdallah and takes him on a journey that brings the keys of misery and suffering into Hasan Abdallah’s life.

D. The Bedouin uses Hasan’s knowledge to find the manuscript that allows him to  turn base metals to gold, making them both rich men.

C. The Bedouin enslaves Hasan Abdallah and takes him on a journey that brings the keys of misery and suffering into Hasan Abdallah’s life.

Explanation:

Sheikh Hasan Abdallah accepts to serve the Bedouin in exchange for enough gold pieces to feed his family for along time. Although the Bedouin claims to need him only as companionship in his journey, Abdallah finally realizes that, not only his family had died, but also that his master had used him to bear the destiny of the Keys of Misery and Suffering, while the Bedouin enjoyed the grace of the keys of Glory, Happiness, and Wisdom.

the answer is "the man who came here yesterday was selling magazines."