[单选题]
An electron is known qp ki:uztqw45: 2p;tmfbgp5 ,tozpb1ie.e ,* kj:0 joo1/xiw/ejtf2 z h be confined to a region of width 0.1 nm. What is an approximate expre12:o,j o k1ib.jt/*f0e i je/xzwhzp ession for the least kinetic energy it could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$