The correct answer is C.
Warranties protect citizens from defective products that break when they shouldn't or stop working.
Obama makes the point that America is powerful because has the potential to constantly reinvent itself. He mentions that America has enough productivity, innovation and capacity to do so. It is also a land which protects the interests of everyone and not narrow interests anymore, and this is path that had to be followed from that moment on.
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.
