It's had been built about since 1958.
Oldest to youngest- D, A, E, B, C
It's called relative dating, you basically find the rocks that are at the very bottom (oldest), look for the ones that are on the top (younger), but if you find any that are cross cutting, those are the youngest of them all.
I believe your answer would be A- Farmers and urban dwellers.
Hope this helps. Correct me if I'm wrong.
Nepal. Bhutan Thailand, there are many more.