As the wavelength of light is decreased, the speed is:

The speed of light in a vacuum is a constant value, approximately 299,792 kilometers per second. This speed does not change with variations in wavelength. While wavelength and frequency are inversely related—meaning as the wavelength decreases, the frequency increases—this relationship does not affect the speed of light in a vacuum. The fundamental equation that relates the speed of light (c) to wavelength (λ) and frequency (f) is given by:

c = λ × f

Since the speed (c) remains constant in a vacuum, any changes in wavelength will correlate with changes in frequency, but they will not result in an alteration of the speed of light itself. Hence, the correct answer reflects the principle that the speed of light is unchanged regardless of the wavelength.