Choose the word which is different from the rest.

The answer is: B. Orange

The other four words (A. Indigo, C. Yellow, D. Pink, and E. Green) are all primary colors. Orange is a secondary color, which is created by mixing two primary colors together. In this case, orange is created by mixing red and yellow.

Primary colors are colors that cannot be created by mixing any other colors together. They are red, yellow, and blue. Secondary colors are colors that can be created by mixing two primary colors together. They are orange, green, and purple.