Magnetic field applied on a cyclotron is $0.7 \;T$ and radius of its dees is $1.8 \;m$ what will be the energy of the emergent protons in $MeV?$

Question

$\begin{array}{1 1} 75\;mev \\ 76\;mev \\ 7.5\;mev \\ 7.6\;mev \end{array}$