[单选题]
An electron is known to1k.pholw -s(oxc,pj46q n9bh+l y r7h b .;t(cabud +xle confined to a region of width 0.1 nm. What is an approximate expression for the least ki( bxa;cdl +u.tnetic energy it could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$
