Ikemefuna moves into Okonkwo's house because the clan asks Okonkwo to take him. Option B is correct.
Ikamefuna is a character of the story Things Fall Apart was published in 1958 to much acclaim by Achebe, who is Nigerian.
The novel deals with the protagonist, Okonkwo, a local leader and wrestling champ in his Igbo, a native Nigerian ethnic group, village of Umuofia, as he navigates the steadily more-ominous presence of colonial forces.