[单选题]
An electron is acceleratd kazrfx5)61qx5yto6a( k z;ced by a pot4*gkb/t grylvefy l2x is l*b25a0:l6ential difference of 100 V. What is its wavel2v4ag2r5 bl*t e 6ilblx:0lyf/gy s*kength?
A. $0.122 \; nm$
B. $0.212 \; nm$
C. $0.221 \; nm$
D. $0.313 \; nm$