The answer is C
Since Dependent clauses can not stand alone
A. Purpose
I believe this is purpose because she is writing to argue that distributing medicine to rural parts of the world was worth doing.
A. unpleasant memories of Mary, who had burned protestants at the stake, remained
Duck tape your eyes so you can’t see it
The right answer for the question that is being asked and shown above is that: "Tom’s abandonment of his family." At the opening of the play, Tom is dressed in a merchant sailor uniform, which foreshadows Tom’s abandonment of his family.