[单选题]
Light of wavelength m pd.5pwlhn sj9u6. +l550 nm in air is foudv(l7 sfmyh 2: am o.0 is.go+lo(jzp*nd 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. $3.6 \times 10^{5} \; Hz$