Which of the Following Is True

Multiple Choice

Which of the following is true?

A) ​People specialize by concentrating their energies on the activity to which they are best suited, because they incur lower opportunity costs as a result.
B) ​One advantage of specialization is that workers acquire greater skill from repetition.
C) ​If a person, a region, or a country can produce a good or service at a lower opportunity cost than others, we say that they have a comparative advantage in the production of that good or service.
D) ​All of the above are true.