The correct answer is: B. 231/2 and 66 in both the hemispheres.
The middle latitudes are the latitudes between the Tropic of Cancer and the Tropic of Capricorn in the Northern Hemisphere, and between the Tropic of Capricorn and the Arctic Circle in the Southern Hemisphere. The Tropic of Cancer is located at 23.5 degrees north latitude, and the Tropic of Capricorn is located at 23.5 degrees south latitude. The Arctic Circle is located at 66.5 degrees north latitude, and the Antarctic Circle is located at 66.5 degrees south latitude.
The middle latitudes are characterized by temperate climates, with four distinct seasons. The summers are warm and the winters are cold. The middle latitudes are also home to a variety of plant and animal life.
Option A is incorrect because it includes the North Pole and South Pole, which are not considered to be middle latitudes. Option C is incorrect because it does not include the Tropic of Cancer and Tropic of Capricorn, which are the boundaries of the middle latitudes. Option D is incorrect because it includes the entire Northern and Southern Hemispheres, which are much larger than the middle latitudes.