[单选题]
Estimate the observed wavelength f ipm*: lz0um ):s3icozno4ok 5or the 656 nm line in the spectrum of a v*z(shr j 8)ed v9tlr*star which is 100 million light-yeartrld*v)s z9(jre8 h* vs from us.
A. $653 \; nm$
B. $656 \; nm$
C. $659 \; nm$
D. $692 \; nm$
