An \[\alpha \]-particle of energy 5 MeV is scattered through \[180{}^\circ \] by a fixed uranium nucleus. The distance of closest approach is of the order of

• A.  \[{{10}^{-12}}cm\]
• B.  \[{{10}^{-10}}cm\]
• C.  \[{{10}^{-14}}cm\]
• D.  \[{{10}^{-15}}cm\,\]