[单选题]
An electron is known to be confineg s isrm*3 a5o3y6bzs4d to a region of width 0.1 nm. Whatrx7*8.hu n tqm lb/po1 is an approximate expression for the least kinetic energy ix ml.p81 n7hq*trbu /ot could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$
