The correct answer is C. As a result of political stability in Argentina during the late 1800s, foreign investments increased and the economy growth.
The investments, coming mainly from the Argentine State and the United Kingdom, were destined to areas such as railway development, ports and cool stores. Much of immigration and modern economic activities moved away from the interior of the country, boosting the concentration of development and wealth in the city of Buenos Aires; which became a prosperous and cosmopolitan city.