The answer is D. the Battle of Hastings
Got this answer by reading through the material.
Instituted in the hope of avoiding war, appeasement was the name given to Britain’s policy in the 1930s of allowing Hitler to expand German territory unchecked. Most closely associated with British Prime Minister Neville Chamberlain, it is now widely discredited as a policy of weakness
Here we have two different decisions.<em><u> Opportunity cost</u></em> of buying the CD and not buying the DVD is 1: ($11-$10). And <em><u>opportunity cost</u></em> of buying the CD and not buying the new T-shirt is 4: ($14-10). <em><u>Opportunity cost</u></em> is the difference between the value of the option chosen and the value of the best option not made. If the option I choose gives me a benefit of 10 but there is an alternative option offered by 12, the opportunity cost is 2.
