Horses are the traditional means of transportation in the Middle East?

Reading the map, we can see that the region is the Middle East, mainly Arab countries; Arabs love white, and the appearance of many buildings is white. The main reason is that the climate is hot and dry, belonging to the tropical desert climate, and white is conducive to reflecting sunlight, so ① conforms to the meaning of the question; Camel is a traditional means of transportation in tropical desert climate areas, so (2) it does not meet the meaning of the question; Due to the scarcity of precipitation in the Middle East, the roofs of traditional houses are mostly flat-topped, which does not meet the meaning of the question; The Middle East, located in the land of "five seas and three continents", is the meeting point and transportation hub of Asia, Africa and Europe.

Therefore, choose: B.