That answer to your question is the letter B
Up until the First Opium War, the foreign threats Han Chinese were used to dealing with were foreign nomadic invaders invading from the north. While Han Chinese were used to being occupied, even by foreign dynasties such as the Mongol Yuan dynasty, the foreign occupiers were always absorbed into the great ocean of Chinese culture and eventually disappeared.
The answer would be B, it involved a deliberate effort to eliminate all the people in one ethnic or cultural group.
Genocide is the systematic, deliberate elimination of everyone in a particular ethnic, cultural political, religious, etc, group.
Answer:
It is estimated that by the early 16th century as much as 10% of Lisbon's population was of African descent. After the European discovery of the American continent, the demand for African labour gradually grew, as other sources of labour - both European and American - were found to be insufficient.