Which of the following identifies the main culprit for america’s increasing weight gain?

The lack of physical activity and a diet high in fat are responsible for America's increasing weight gain.

Explanation:

Children are less active today than they were 40 or 50 years ago.  Prior to the technology boom, many children played outside -- running, throwing, kicking, biking, swimming and engaging in other outdoor activities. Today, few children participate in those activities and appear to be more interested in playing video games and interacting on social media.

In the past, Americans ate home-prepared meals and did not eat as much processed foods as we do now.  Processed foods (frozen and canned) contain more salt, preservatives, and fat than do home-cooked meals.  Additionally, Americans eat fast food containing more calories, fat and salt than some other processed foods.  

The combination of consuming predominately high calorie foods and maintaining a low level of physical activity has caused America to get FAT.