The correct option is C. The position of a place on the equator is usually measured in degree of latitude. Latitude is the geographical coordinate, which specifies the north south position of a point on the earth surface. Lines of latitudes are called parallels. The equator is zero degree, the north pole is 90 degree north and the south pole is 90 degree south.
The changing ocean currents lead to climate cooling by bringing cooler breezes to places with higher climates. The cool breezes push the warm air out and leads to the drop of temperature
