Through what angle is a 4 MeV a particle scattered when it approaches a gold nucleus with a impact parameter of 2.6 X 10-13 m？（）。

Through what angle is a 4 MeV a particle scattered when it approaches a gold nucleus with a impact parameter of 2.6 X 10-13 m？（）。
A.12.49o
B.24.98o
C.6.25o
D.49.96o
正确答案：12.49o