If an electron and a proton having same momentums enter perpendicularly to a magnetic field, then

Question

$\begin {array} {1 1} (a)\;\text{curved path of electron and proton will be same} \\ (b)\;\text{they will move undeflected} \\ (c)\;\text{curved path of electron is more curved than that of proton}\\ (d)\;\text{path of proton is more curved} \end {array}$