单项选择题Here is a riddle. I am suspended in the air, I touch nothing, and I am surrounded by lights. Now I dress myself afresh, and now I am naked, and I am in the heat and the cold, by night and by day. Everyone amuses himself by tramping upon me, even the animals abuse and scorn me, and yet I have such treasures hidden in my bosom that he who finds them I can make full of happiness. What is the answer to the riddle
A.The Sun
B.The Moon.
C.The Earth.
D. The Sky.