[单选题]
An electron is known *aj 09de -2v*em s:8;6t cudbfhfpvt ltomr,opm 0udtm .3g i1u; be confined to a region of width 0.1 nm. What is an approximate exppr03 tumg o1um;dim,.ression for the least kinetic energy it could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$