[单选题]
An electron is known to be confined to a region ofi:nhnou ww*;3ti w7o ltkb,ml9m7f :6 wid5 9 qxk a/2b;zu)g pm*rb.imvvth 0.1 nm. What is an approximate expression for the least kineti2k9/x bap* rvmgb zv .;miu)5qc energy it could have, in eV?
A. $2.7 \; eV$
B. $3.2 \; eV$
C. $3.8 \; eV$
D. $4.3 \; eV$
