The Authoritative Medical Journal the Lancet Highlighted in 2016 Four

The authoritative medical journal The Lancet highlighted in 2016 four key themes related to the relationship between health and physical activity. Which of these was not one?

A) The relationship between sitting time, physical activity and the risk of death.
B) The health gap between rich and poor.
C) The economic burden of physical inactivity.
D) The need for future actions and a smarter approach to physical activity.