Final answer:
The color not represented in a bag of Reese's Pieces is brown.
Step-by-step explanation:
The correct answer is d) Brown. A bag of Reese's Pieces does not contain brown candies. Reese's Pieces are small candy-coated peanut butter candies that are popular in the United States. The candy coating typically comes in three colors: orange, yellow, and red. So, the colors represented in a bag of Reese's Pieces are orange, yellow, and red, but not brown.