The correct order is 4-3-1-2. Sentence 4 introduces the conflict between Western Christian concepts and indigenous African tradition. This gives context for the discussion to be followed. Now we can see that Sentence 3 starts with "However...." which implies that this sentence is challenging the views presented in Sentence 4 by asserting the existence of a rich indigenous African cultural ethos. Therefore Sentence 3 must be following Sentence 4 . Sentence 2 introduces Chuwkuemeka Ike and provides additional information about Chukwuemeka Ike's exploration of the conflict, adding depth to the discussion. Sentence 1 introduces an example of contemporary African writing that explores the conflict. It makes sense that first we give an example and then elaborate on it. Sentence 1 introduces the book; it is a logical inferences that Ike must be the author of this book. Therefore Sentence 2 must be following Sentence 1. Therefore the correct order is 4-3-1-2.