[单选题]
Starting from rest, a proton falls through a potential difference of 1j(o mavnaxox 9/q+c*8f;7qrc 200 V. qyfy)i,a9s d *x us,9gr0/rbxWhat speed does xxr*,y0s9fru ay b,d) g9/iqs it acquire?
A. $1.2 \times 10^{5} \; m/s$
B. $2.4 \times 10^{5} \; m/s$
C. $3.6 \times 10^{5} \; m/s$
D. $4.8 \times 10^{5} \; m/s$
