The correct option is D 6000°C
The Sun is 4.6 billion years old. It is largely composed of hydrogen and helium. The surface of the Sun gives off the Sun's energy in forms of heat and light.
The temperature at the surface of the Sun is about 6000°C.
The temperature rises from the surface of the Sun inwards towards the very hot center of the Sun, where it reaches about 15,000,000°C.
The temperature of the Sun also rises from the surface outward into the solar atmosphere. The uppermost layer of the solar atmosphere reaches temperature of million of degrees Celsius.