The correct answer to your question would be D.
The Rape of Nanjing was significant because of the sheer volume of people who were massacred, because it was actually a direct act of manipulation and terrorism, these two things made also the United States more attentive towards the happening in the Pacific as it saw that the Japanese had an increased growth in influence over this region.
Yes, most of the travelers on the Oregon Trail was young families. In the mid-19th century, the Oregon Trail was the main pathway for American emigrants searching for new lands and opportunity on the frontier, and most of the emigrants traveling were young families.
B. Strengthened power of feudalistic lords
The answer is A. Catholic leaders grouped up and wanted to respond to the concerns of the new Protestants.
George Washington was a General who helped fight in the American Revolution. He THEN was elected for president.