If the Wavelength of a Monochromatic Source Is 316 Nm

Multiple Choice

If the wavelength of a monochromatic source is 316 nm in vacuum,what is the wavelength from the same source when it passes through a liquid where the speed of light is 1.86 × 10⁸ m/s? (c = 3.00 × 10⁸ m/s)

A) 590 nm
B) 510 nm
C) 566 nm
D) 196 nm
E) 121 nm