Answer:
The correct answer would be option D, Millennial.
Step-by-step explanation:
Burger King's target demographic for its Satisfries was most notably mothers of young children. So Burger King was most likely to target the Millennial.
If a person has reached its young adulthood in the early 21st century, he is considered to be a Millennial. So the mothers who reach their adulthood in the early 21st century became mothers and now their children are young. So Burger King targeted them on the basis of this demographic.