[单选题]
An electron is known to be confined to a region of wid (i u-aalu3mb1th 0.1 nm. What is a tm fl(j6jd) -:ztqr;op02bjfn approximate expression for the least kinetic energy it could have, in eV)mdfojz 2b:0 qfpt-tj j (6l;r?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$
