Answer:
Red.
Red M&Ms because of a health scare concerning Red Dye Number 2, which at the time was the most common red food dye in use.
These classic chocolate candies were absent from store shelves across the United States for more than a decade because of their color. In 1976, Mars, the candy company that makes M&M's, eliminated the red version of the candies from their mix.
Step-by-step explanation:
You're welcome.