How do the witches' prophecies come true? Be specific.
a) The prophecies come true through Macbeth's actions and manipulation of fate, leading to his downfall.
b) The prophecies are fulfilled through the intervention of supernatural forces, demonstrating the witches' power.
c) The prophecies come true through coincidence and chance, highlighting the unpredictability of life.
d) The prophecies remain unfulfilled, suggesting the limitations of supernatural foresight.