To complete the sentence, you would need to choose an option from the drop-down menu. Since I can't see the menu, I'm unable to help you with the specific options available. However, it seems like the sentence is asking for an example of tense relations between the Hausa people and the Igbos and Yorubas in Nigeria. You can choose an option that correctly describes the situation. Some possible options could be "ethnic conflict," "cultural differences," or "inter-tribal tensions." Consider the historical context and the relationship dynamics between these groups in Nigeria to make an informed choice.
