Answer:
Part A: She is driven by her creative genius
Part B: The force of her own gift alone drove her to it.
Explanation:
Part A-
In "Shakespeare's Sister", Virginia Woolf openly tells us the force of her own gift alone drove her to it so that is the only answer that makes sense.
Yes, she is angry at her father and doesn't want to get married but Judith says "How could she disobey him" so we know this ISN'T the reason she chooses to go. We also know the answer CAN'T be B because she never tells us she wants to join her brother, we are only told that they have a similar gift.
Part B-
The evidence has to be "The force of her own gift alone drove her to it" because this direct quote tells us the answer so it is the only evidence that fits.