Wire A has the same length and twice the radius of wire B$.$ Both wires are made of the same material and carry the same current. Which of the following equa$-$ tions is true concerning the drift velocities vA and v B of electrons in the wires? $($a$)$ vA $52$vB $($b$)$ vA $5$ vB $($c$)$ vA $5$ v B $/2($d$)$ vA $54$v B $($e$)$ vA $5$ v B $/4$