What traditional, ritual circumstance prevents Ezeulu from giving Umuaro permission to harvest the yam crop?

• A. Obika s death renders the yam harvest impure, and therefore not to be eaten.
• B. He has not eaten the ritual yams left over from the last harvest.
• C. Obika ate the ritual yams left over from the last harvest instead of him.
• D. He ate the ritual yams left over from the last harvest too quickly.