<span>I think its C.A large labor force that had left the villages was available for work in city factories.</span>
Answer:
Muslim forces ultimately expelled the European Christians who invaded the eastern Mediterranean repeatedly in the 12th and 13th centuries—and thwarted their effort to regain control of sacred Holy Land sites such as Jerusalem. Still, most histories of the Crusades offer a largely one-sided view, drawn originally from European medieval chronicles, then filtered through 18th and 19th-century Western scholars.
Explanation:
Poverty, because it is a negative factor, causing someone to want to leave the country.
The answer to the item that you posted is letter A. The Olduvai Gorge in Tanzania is the site of many findings of the earliest humans. It is also one of the important sites to which many had learning and understanding about the human evolution.