The correct answer to the question is A). Visible light i.e the electromagnetic spectrum which can be detected by human eyes is visible light.
EXPLANATION:
An electromagnetic spectrum contains various electromagnetic waves which are arranged either in ascending order of frequency or in ascending order of wavelength.
Various electromagnetic waves are named as gamma ray, X-ray, U.V ray, visible light,infrared wave,micro wave and radio wave respectively .
Only the electromagnetic radiations whose wavelength corresponds to 350 nm to 700 nm can be detected by the human eye.
The visible region of the electromagnetic spectrum corresponds to the this wavelength.
It contains white light with its constituent seven colors starting from violet to red. Violet color has the highest frequency, and red has the least frequency in this region.
