Do you have more of an idea other than just ancient castles?
Yes and no. Yes because people can reproduce to keep the population of the species alive. The reason i said no is because animals and plants keep the human race alive. Plants and animals are technally food. Plants circulate the oxygen so we can breathe.
<span>In the question they mentioned Come and show me another city with lifted head singing so proud to be alive and coarse and strong and cunning. Here is a tall bold slugger set vivid against the little soft cities. In the first line they mentioned singing, which would appeal to the sense of sound. So the answer should be 'hearing.'</span>
To start off, you want to get zero population growth. That means you can eliminate A and D automatically since it's the opposite effect of what you want.
That leaves B and C. Both are good idea if I may say but, they are unreasonable and unethical. (Not as much as A and D) Although, it is only just a question.
After a good time of thinking this through I would pick letter C. Let me explain though.
It is very easy to increase the death rate. There are so many ways to achieve zero population growth by doing so.
Now, obviously this means you would have to (for a nicer term) put down people. Those I will not list but, you can surely image them if you'd wish.
The reason I took B out of the equation is because, I feel as though it would take too long. That's the only reason.
Like I said I would pick C. I hope this helps!!