Concept:Temperate crops require cooler temperatures found in high-altitude areas.Explanation:In Nigeria, temperate crops such as temperate vegetables and fruits are grown on high plateaus where the climate is cooler.The Jos Plateau and Mambilla Plateau are the main highland areas in Nigeria with suitable lower temperatures for temperate crops.The other options are lower or less suitable highland regions.Answer:A. Jos Plateau and Mambilla Plateau