Final answer:
The ratio of U.S. children diagnosed as overweight or obese is 1 in 5, with childhood obesity being diagnosed based on BMI and being a serious public health issue.
Step-by-step explanation:
The ratio of children diagnosed as overweight or obese in the United States is 1 in 5 (Choice B). Obesity has become a significant public health concern, with obesity rates in both adults and children rising steadily since the 1980s. Childhood obesity in particular is associated with several health issues, such as type 2 diabetes and heart disease. The accurate diagnosis of obesity in children is often based on the Body Mass Index (BMI), and overweight is the term commonly used to describe children with excess body fat to avoid stigmatization.