[单选题]
An electron is known to be confined to a region of width 0q)5w:4sddia/ r5ijg pm-uf2 ignn.,q.1 nm. What is an 1q.-4j z hhvi tn,xw7vapproximate expression for the least kinetic energy it couhznvv,1q-x .7i wj4ht ld have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$