Erbia is a developing country. Erbia’s neighbor Glassen is also a developing country, which is growing at a fast rate by adopting existing technology. Unlike Glassen, Erbia is not growing as fast as it should. Which of the following could be one of the reasons for the slower growth in Erbia?               a.          Erbia lacks a reliable source of electricity to power new technologies.               b.          Erbia has adopted an export-oriented trade policy.               c.           The manufacturing sector is the highest contributor to Erbia’s national income.               d.          Erbia has a low birth rate, and therefore, population growth has slowed in Erbia.               e.          Erbia has invested heavily in consumer products.