What were the greatest problems with building
a city on the site of calcutta?

the answer to your question is:

strong-mayor system

the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.

d) post-world war i