The Comparative Advantage in Production of a Specific Good Can

The comparative advantage in production of a specific good can shift over time from one country to another because

A) goods experience a product life cycle.
B) skilled labor tends to "follow the market."
C) resources, especially natural resources, are eventually used up; therefore, production must shift.
D) capital stocks depreciate, thus shifting production to countries with more modern plants and equipment.
E) of changing international trade agreements.