[单选题]
13.01: Red light from a laser is noted to have a wavels ( 0(m/vvy:mwx spz2seng,9 spn o-m q,lnzv61bvth of 632.8 nanometers. Which one of the following choices best represents the meaningq , ,vzo1-6snn vpmlb9 of the prefix nano?
A. $10^{−3}$
B. $10^{−6}$
C. $10^{−9}$
D. $10^{−12}$
E. $10^{−15}$
