Which statement about colour blindness is correct?

The correct option is B $2\%$ men are red colour blind, $6\%$ are green colour blind

• Deuteranomaly (most common—6% of males, 0.4% of females): These individuals have a mutated form of the medium-wavelength (green) pigment.
• Protanomaly (2% of males, 0.01% of females): Having a mutated form of the long-wavelength (red) pigment, whose peak sensitivity is at a shorter wavelength than in the normal retina, protanomalous individuals are less sensitive to red light than normal.

So, the correct answer is '2% men are red colour blind, 6% are green colour blind'.