The correct answer to the question is : Photosphere i.e it is the region whose temperature is 6000 degree celsius.
EXPLANATION:
The Sun has many regions starting from photosphere to central core. Different regions of the sun has different temperature.
The temperature of the sun is due to the fusion occurring inside it. The core temperature is immense due to the gravitational attraction which produces more heat there. Gradually the temperature decreases as we move away from the sun core.
As per the question, the temperature is given as 6000 degree celsius.
The region of the sun which corresponds to this temperature is photosphere. The temperature of photosphere varies from 5500 degree celsius to 7500 degree celsius. The temperature of sunspots found in the sun may be lower than the average temperature of the photosphere.
Hence, the correct answer is Photosphere.
