Out of the four policies that were suggested, I think the most effective one would be the "Improvement of Preventive Care and Health Promotion" policy.
新鮮な野菜は健康を増進する。
Fresh vegetables promote health.
健康は幸福を増進する。
Good health is conducive to happiness.
科学と芸術は人類の幸福の増進に貢献しなければならない。
Science and art must contribute to the promotion of human welfare.
運動して食欲を増進させよう。
Let's do some exercise to work up an appetite.
その計画を実行すれば我々双方の利益を増進することになろう。
It will be to our mutual benefit to carry out the plan.