What are the six cities the question asks about
Answer:
2
Explanation:
learned this in history class.
When young people migrate from a rural area which probably already is suffering from a low birthrate, this effectively eventually can create a "lack of life" in a certain place where after a decade or a few decades, a certain rural area can actually die out due to not enough young people being there anymore.
All could be said but specifically F or/and D the most likely is F though
