[单选题]
Light of wavelength 550 nm i)*y qw9,o *ms whbok*mn air is fouyq.:nun q7soy/lj x :l*+. tomnd to travel at $1.96 \times 10^8 \; m/s$ in a certain liquid. Determine the frequency of the light in the liquid.
A. $5.5 \times 10^{14} \; Hz$
B. $3.6 \times 10^{14} \; Hz$
C. $5.5 \times 10^{5} \; Hz$
D. $3.6 \times 10^{5} \; Hz$
