To answer this question, we need to understand the concept of color mixing. When we mix different colors, we can create new colors. The primary colors, which are red, blue, and yellow, are the building blocks for all other colors. By mixing primary colors, we can create secondary colors, such as purple, green, and orange.
Option A) Purple, green, and red - This option is incorrect because it includes red, which is a primary color and cannot be obtained by mixing other colors.
Option B) White, black, and gray - This option is correct because it consists of equal amounts of all basic colors. White is the absence of color, black is the combination of all colors, and gray is a neutral color.
Option C) White, red, and blue - This option is incorrect because it does not include equal amounts of all basic colors. It includes white, which is the absence of color, and red and blue, which are primary colors.
Option D) Black, blue, and gray - This option is incorrect because it does not include equal amounts of all basic colors. It includes black, which is the combination of all colors, and blue and gray, which are not equal amounts of the basic colors.
The correct answer is B. This option consists of equal amounts of all basic colors - white, black, and gray.