[单选题]
An electron is known to be confined to a regrdrpzb(dgdxg89 f n 8;y l643mion of i.skl36uotlkui 4 j*tok 1eueu4hg-qk q,,6 0width 0.1 nm. What is an approximate expression for the least kinetic energy it could have, in k l.ouhu4t0 k3 -uqe6,iek4ko1qj *,ilu6tsgeV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$
