The Importance of the Size of Nations for Economic Growth

The importance of the size of nations for economic growth in today's global economy might best be summarized as follows:

A) Since the economy is so global now, the costs of being small have gone down.
B) Because people are ones who innovate, population size matters more than ever for growth.
C) Since international trade spreads technology, the size of the world's population does not matter.
D) Small countries would be well-advised to avoid too much international trade for fear of having their best ideas stolen by others.