The correct answer is D. All of the above.
The South Frigid Zone is the region lying between the Antarctic Circle and the South Pole. It is the southernmost of the three frigid zones, and it is the coldest region on Earth. The South Frigid Zone is characterized by its extreme cold, its long periods of darkness, and its lack of vegetation.
The Antarctic Circle is a circle of latitude that runs 66.5 degrees south of the Equator. It is the southernmost latitude at which the Sun can be seen at midnight on the summer solstice. The South Pole is the southernmost point on Earth. It is located in the middle of the Antarctic continent, and it is the coldest and windiest place on Earth.
The South Frigid Zone has the coldest climate throughout the year. The average temperature in the South Frigid Zone is -57 degrees Celsius (-70 degrees Fahrenheit). The coldest temperature ever recorded on Earth was -89.2 degrees Celsius (-128.6 degrees Fahrenheit), and it was recorded at Vostok Station in Antarctica.
The South Frigid Zone is also characterized by its long periods of darkness. During the winter, the Sun does not rise above the horizon at all, and the region is in darkness for 24 hours a day. During the summer, the Sun does not set below the horizon at all, and the region is in daylight for 24 hours a day.
The South Frigid Zone is also characterized by its lack of vegetation. The only plants that can survive in the South Frigid Zone are mosses, lichens, and algae. These plants are able to survive in the cold and harsh conditions of the South Frigid Zone because they have a very slow metabolism.
The South Frigid Zone is a very important region for the study of climate change. The Antarctic ice sheet is the largest ice sheet on Earth, and it is melting at an alarming rate. The melting of the Antarctic ice sheet is contributing to sea level rise, and it is also changing the climate of the entire planet.