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.
<span>a progressive Republican social reform</span>
To work on their plantations, which were their main source of income. The plantations required a lot of really intensive and dangerous work that the colonists did not want to do themselves. They realized that African slaves provided cheap labor and could be easily replaced.
Eventually, the colonists just became over reliant on this slave labor, which is why they “needed” it.
They used mules, horses and oxen. They are very strong animals and can pull a ton of weight, that is why they chose them.
