Answer:
Gold
Explanation:
The discovery of gold led to a large population growth in California in the mid-1800s.
I think do not compete or retaliate because if you ignore them they might think your busy with something. Like pretend to be on your phone or something or just do something that makes them think your busy. Then they will probably go away. That's my opinion so it might be C or A but if they are doing something very bad then D.
The production of tobacco.
The Hagia Sophia is in Istanbul (Turkey).
In its history, it has been a medieval church, a Byzantine Cathedral, and a mosque.
Today, it is a museum for the Ottoman and Byzantine history of the area.
