Answer: b. Is the Chinese food that you gave up when you chose to eat Italian food.
Explanation: Opportunity cost refers to the cost of the next best alternative foregone or sacrificed. When an individual chooses to take a certain action, then his opportunity cost of doing that will be the alternatives that he has foregone.
IT can be expresses as,

When the individual chooses Chinese food when he could have choose to eat Italian food, his opportunity cost will be the Chinese food that you gave up.
For other options there is no information on what was given up.
To correct avoid high unemployment, one of the measures done by the architects of Bretton woods is to agree on building a limited flexibility into the fixed exchange rate system. In addition, it was stated in the argument that the rules and regulations of the monetary management between the U.S., Canada, Western Europe, Australia, and Japan must be systematically established.
The system that Beswick widget ltd is using in means of
monitoring unit sales of its production and to measure changes taking place
with the taste of the customers is the feedback control. This is a system where
it is responsible for examining the order in means of making changes to have an
improvement in terms of the efficiency of the output.