

My assumption (!) is that either a) Didn’t have the resources to properly enforce it everywhere efficiently. (particularly in rural area), don’t get me wrong, they did enforce it in the areas they could, or b) The death rate was also decreasing and life expectancy was improving due to economic growth, better availability of modern medicine, etc. so keeping the birth rate stable would still mean the population would grow.
Interesting tidbit, after 2015, the One Child Policy was replaced by the Two Child Policy, and in 2021, the Three Child Policy. Shortly after, the restriction was essentially gone and now aforementioned efforts to increase the birth rate are being made.
I think you misunderstand. It looks like three questions (rather than three answers to one), “Do you support diplomatic solutions to achieve peace?”, “Do you support economic efforts to achieve peace?”, and “Do you support military efforts to achieve peace?”, with yes/no presumable for each.
Diplomatic solutions meaning talking it out, treaties, etc.
Economic efforts would mean investing in industry, possible stuff about economic sanctions, etc. I think
Military support meaning defending either from an invasion from the other presumably.