The correct answer is (c) 6.
Sunlight is a mixture of all the colors of the rainbow, which is why it appears white. When sunlight hits a prism, it is separated into its component colors, which we see as a rainbow. The colors of the rainbow are red, orange, yellow, green, blue, indigo, and violet.
The number of colors in sunlight is often said to be seven, but this is not strictly accurate. The colors of the rainbow are actually a continuous spectrum, with no sharp boundaries between them. However, for convenience, we often divide the spectrum into seven colors.
The colors of the rainbow are also known as the visible spectrum. This is because they are the only colors that our eyes can see. The visible spectrum is a very small part of the electromagnetic spectrum, which includes all types of radiation, from radio waves to gamma rays.
The colors of the rainbow are important because they are used in many different ways. For example, they are used in art, design, and advertising. They are also used in science, for example in spectroscopy, which is the study of the interaction of matter with electromagnetic radiation.