A.About 700 million light-years from Sun.B.About 700 million light-years from Earth.C.
A.About 700 million light-years from Sun.
B.About 700 million light-years from Earth.
C.About 700 million light-years from the black hole.
D.About 700 million light-years from a galaxy.
请帮忙给出正确答案和分析,谢谢!