[单选题]
Light of wavelength 550 nm in air is found to t-:m 4:zd(cw (qp gskq3riqsw2ravel f dgit9mh 8o-3w:gsu3at $1.96 \times 10^8 \; m/s$ in a certain liquid. Determine the wavelength of the light in the liquid.
A. $550 \; nm$
B. $359 \; nm$
C. $281 \; nm$
D. $303 \; nm$
