Read the passage carefully.

Many people are looking for ways to eat healthier but have a hard time giving up sweets. Foods with excess sugar have been shown to negatively affect health. However, recent research suggests that chocolate may be the exception. More research is supporting the idea that chocolate, especially dark chocolate, can have positive effects on the body (Crichton 1). Of course, all foods should be consumed in moderation.

Geoffrey wants to highlight the main idea of the passage. What should he highlight?

“Foods with excess sugar have been shown to negatively affect health.”
“research suggests that chocolate may be the exception”
“dark chocolate, can have positive effects on the body”
“all foods should be consumed in moderation”