The correct option is C 63.5°S
Despite there being a number of Parallels of Latitude, there are some that are considered to be more significant than the rest. This importance is a direct result of the location of these specific latitudes with respect to the angle at which the sun's rays strike the earth's surface. Here, the 63.5°S latitude is not considered to be a "special" latitude whereas the North Pole, South Pole, Arctic Circle, Antarctic Circle, the Tropic of Cancer and the Tropic of Capricorn are considered as special latitude.