I figure A, "Britain continued to impress American sailors and violate American shipping rights during its war with France" is correct.
There were several different reasons why the US entered WWI. One of the biggest ones that was public was the sinking of the Lusitania. This British ship, that carried American passengers, was entering what was considered a war zone at the time. Even though the Lusitania was entering a war zone, it was a passenger ship (meaning it had nothing to do with the military). Despite this fact, the Germans still used submarine warfare in order to destroy it. The Lusitania sank, killing over 100 Americans. This public event caused American citizens to be angry with Germany and their use of submarine warfare.
Along with this, the public reveal of the Allied powers interception of the Zimmerman Telegram also lead US into World War I. This telegram was supposed to be a secret message in which an alliance was formed by Germany and Mexico. Germany wanted Mexico to invade the US and help them win World War I. Once intercepted, this became public knowledge as to what Germany's plans were and resulted in the US officially declaring war shortly thereafter.
The correct answer is B.
If the quantity demanded of a good is larger than the amount produced, a market disequilibrum situation is taking place. Markets tend to adjust in order to reach equilibrium again, which is the situation in which desires of consumers (demand) and willigness to produce of companies (supply) are equal.
In this situation of excess demand, prices will rise until every consumer who demands the product at the larger new price is able to purchase and consume it, and until the whole production is sold. Therefore, out of the consumers who previously consituted the excess demand, those who were willing to pay the lowest prices are discarded.
"Each slave was counted as three-fifths of a person" is the way in which the Constitutional Convention resolved the issue of whether or not to count enslaved people when determining states representation in the House, since this seemed to satisfy both the northern and southern states.