Protons with Kinetic Energy of 1 $\circ$
B)35 ^$\circ$
C)50 ^$\circ$

Protons with kinetic energy of 1.6 MeV scatter off a lead (Pb) nuclei in a foil target.Each Pb nucleus contains 82 protons.If both the incoming protons and the Pb nuclei can be treated as point objects and the differential scattering cross section for the protons to scatter off the Pb nuclei is 3.2 * 10^-27 m²/sr,what is the scattering angle relative to their initial velocity?

A) 57 ^$\circ$
B) 35 ^$\circ$
C) 50 ^$\circ$
D) 70 ^$\circ$
E) 25 ^$\circ$