The correct answer is: A man with colour blindness will see red as green.
Colour blindness is a condition in which a person cannot see certain colors. The most common type of colour blindness is red-green colour blindness, which affects about 8% of men and 0.5% of women. People with red-green colour blindness have difficulty distinguishing between red and green. They may also have difficulty distinguishing between other colors, such as orange and yellow.
There is no cure for colour blindness, but there are ways to manage it. People with colour blindness can learn to identify colors by their brightness or by their position in the spectrum. They can also use special glasses or contact lenses that help them to see colors more accurately.
The other options are incorrect because a man with colour blindness will not see red as red, orange, or yellow.