16th President of the United States saved the Union during the Civil War and .... In time, however, the blockade became more effective .
The correct answer is B) "Bought grain, stored it, and resold it during times of low harvest":
Following a tendency of nationalizing several industries, which included salt, iron, and liquor, emperor Wu decided to interfere with the trade of grain in 110 BC. This happened as a response from the government to eliminate speculation generated by merchants by selling previously stored grain at below-market prices.
I think it's the second one
The British Army had the advantage of having more ships and weapons than the Continental Army.