The answer is A. They are darker than the rest of the sun and that is why they are called sun spots. They look like little spots on the sun. We cannot see them with our naked eye so don't burn your eyes alive trying but when compared with scientific tools, you can see darker spots. They are also cooler than the rest of the sun. Surprisingly, they emit more energy than the rest of the sun also.
B)Sunspots do move
C)They are not brighter (already established)
D)Sunspots are like 14 times bigger than Earth