This is a hard one. But business people would make sense. As they're the ones who know how to get kids to want things. They put character's on food and things like that. That would make the most sense from what she's saying.
Michelle Obama is likely addressing the business people.
Explanation:
This speech by Mrs. Michelle Obama was given as a part of her "Let's Move" initiative, working towards providing healthier eating habits to children. She asks the corporate people to make thing more healthy, for they are the first choice and source of any kid in learning about things. Children are more prone to the technological world, with the easy access to anything. So, these business are the ones producing and selling the things that are available in the markets, and kids learn a lot in the internet. So, whatever they see trending, they tend to follow that trend. They are easily influenced by what they see being advertised, and s it is upon these businesses to make the right choice of advertising healthy eating habits so that the children will also adhere to what is being advertised and eat healthy.
