[单选题]
A proton travels through a potential of 1.0 kV and then movetq +etg6e1v1fsyu /r)3,w8hx9gvj jdt into a magnetic field ofx u8d 9w,yt3/jvg)hrj 0.040 T. What is the radius of the proton's resulting orbit?
A. $0.080 \; m$
B. $0.11 \; m$
C. $0.14 \; m$
D. $0.17 \; m$
