Answer:
Long staple cotton was profitable because the cotton fibers could be easily separated from the seeds. ... While reducing the number of slaves needed to grow cotton the cotton gin greatly increased the areas where cotton could be profitably grown. This increased the demand for slaves.
I believe the answer is C.
Sorry if its wrong tho.
Answer: Encouraged by the refusal of Western powers to aid China, Japan's imperial government felt that it could impose harsh terms for peace on China. ... Japan had taken the first successful step in what would be a vigorous policy of territorial expansion in East Asia
Explanation: