Im afraid
although I like to mask my fear
I prefer to stand clear
tall buildings mountain tops
or simply just a roof
I imagine the worst
I tremble and even sometimes curse
it's very common to fear
but I prefer to not let my friends hear
as I feel they may make fun
I'd rather suffer instead of run
it may not come when you're young
climbing trees and riding rides
until you feel the fear
and then riding those rides may be hard
lots of courage to ride once more
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!!