The diencephalon is a part of the brain located inferiorly and anteriorly to the corpus callosum, part of the telencephalon, and superior to the midbrain, delimited by the latter by an imaginary line that runs from the nipple to the posterior commissure (epithalamus). The diencephalon consists of: thalamus, hypothalamus, epithalamus, metatalamus and subthalamus. For this reason, we can conclude that the correct answer to your question is "d. All of the above".
In developed nations people have more fast food options which lead to cardiovascular disease. As well as screen time all day since this is one of the factors of cardiovascular disease. Undeveloped nations don't have fast-food or television to watch all day, since they play outside.
