Answer:
The correct answer is letter "D": national competitive advantage.
Step-by-step explanation:
American Professor Michael Porter (born in 1947) proposed the National Competitive Advantage Theory to give an idea of why some countries achieve success in determined industries compared to others. The theory, in other words, aims to explain nations' competitive advantage and the path to reach it.
Also known as Porter's Diamond Model, the factors Porter based his concept on are firm strategies, structure and rivalry; related industries; demand conditions; and, factor conditions.