请选择ABCD+Y(F2z+?2B2K0U*I/O0s5v5`There are more than __ stars in our galaxy and our Sun is only one of them.*l7G9w2w0x7F
A. 200 billion*l7G9w2w0x7F
B. 200 billions*l7G9w2w0x7F
C. 200 billions of*l7G9w2w0x7F
D. 200 billion of*l7G9w2w0x7F