The best option regarding why the Renaissance began in the Italian city-states would be "<span>B. Some wealthy merchants used their wealth to support humanist ideas, learning, art, architecture, and literature," since most of the artists were directly funded by wealthy families. </span>
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.
Slaves worked for free and had to do all hard labor that they were told to do.
Mongolia was a part of China in 1900.
