The answer is C. White.
The other four colors (blue, green, yellow, and violet) are primary colors, while white is a secondary color. Primary colors are colors that cannot be created by mixing other colors together. Secondary colors are colors that can be created by mixing two primary colors together.
Blue is a primary color because it cannot be created by mixing other colors together. It is a cool color that is often associated with peace, tranquility, and sadness.
Green is a primary color because it cannot be created by mixing other colors together. It is a cool color that is often associated with nature, growth, and harmony.
Yellow is a primary color because it cannot be created by mixing other colors together. It is a warm color that is often associated with happiness, joy, and sunshine.
Violet is a primary color because it cannot be created by mixing other colors together. It is a cool color that is often associated with royalty, luxury, and mystery.
White is a secondary color because it can be created by mixing two primary colors together. It is a neutral color that is often associated with cleanliness, purity, and innocence.