Why should colour be used sparingly in graphical alarm displays?

Why should colour be used sparingly in graphical alarm displays?
A . Because 10 percent of the population has some form of colour blindness
B. Because 5 percent of the population has some form of colour blindness
C. Because 15 percent of the population has some form of colour blindness
D. Because 13 percent of the population has some form of colour blindness

Answer: A