Which of the Following Is True

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) The primary reason people pursue their comparative advantage is their self-interest.
C) One advantage of specialization is that workers acquire greater skill from repetition.
D) 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.
E) All of the above are true.