The right answer for the question that is being asked and shown above is that: "(D) The light would have been weakened" if Merriman had touched The Clock pendulum while retrieving the book of Gramarye then <span>(D) The light would have been weakened</span>
He should to decide what priorities he has. And then think which of those he wants. But if he doesn't confident enough he doesn't need to use his last wish.