Final answer:
Red is not a traditional color of Mardi Gras. The official Mardi Gras colors are purple for justice, green for faith, and gold for power, chosen by the Krewe of Rex in 1872.
Step-by-step explanation:
The color that is NOT a traditional color of Mardi Gras in New Orleans is c) Red. The three official colors of Mardi Gras are purple, representing justice; green, representing faith; and gold, representing power. These colors were selected in 1872 by the Krewe of Rex, one of the oldest participating groups in the Mardi Gras parades. Purple represents justice, green represents faith, and gold represents power.