[单选题]
A stationary proton i iwgp+)(wph6 n1xjq7p mfq2 eg0a)/4*kz5xvyuspc .5z yx5 i mrj:mr: s in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetc a )gpjuer:*50vm/q4mx2imkxyyzs 5.5z :fric force on the proton?
A. zero
B. $1.6 \times 10^{-20} \; N$
C. $3.2 \times 10^{-20} \; N$
D. $1.6 \times 10^{-21} \; N$