[单选题]
An electron is known to be confined to a region of wid* nma 9pmv/aj)8q mc,lth 0.1 nm. Whzz0krgbx: ;o8fwaxu3( ,rhb; at is an approximate expression for the le;rfkbr (:gx;3a wh,zoz0 ux8bast kinetic energy it could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$