Question: who determined that ikemefuna should be sacrificed?
Answer: As Okonkwo, Nwoye, and Ikemefuna are happily eating the rare food, Ogbuefi Ezeudu, the oldest man of the village, calls on Okonkwo to speak to him privately. He tells Okonkwo that the Oracle has decreed that Ikemefuna must be killed as part of the retribution for the woman killed three years before in Mbaino.