Answer:
D. strong and supportive
Step-by-step explanation:
A plan to be healthy not only includes exercise routine and eating good foods, but also includes a healthy social routine around comforting people that will help you feel good. In this sense, alternative (D) is the right one, since people who are emotionally strong and supportive will support you to be a confident and happier person. This will directly affect your health as the right environment with helping friends improves people's mental and social health.