A. This study takes its place alongside earlier research showing
B. that kids who are allowed to serve their own food
C. take smaller portions than they would typically be served
D. and ate 25 percentage less, and that kids tend to eat more
E. when the portions on their plates have been double.
Option (D)
25 percentage less is erroneous - 25 percent less is correct usage. Use the word “percent” with numbers; use “percentage” without using a number. For example: 50 percent children, and a considerable percentage of children.