The answer is B: economic.
The economic recession that began through poor banking practices in the USA was spread worldwide revealing an intricate economic and globalized connection between all countries of the world that go far beyond the housing market. This revealed that if a country´s market crashes, especially one as powerful as that of the USA, other countries´ markets and economies will also take a dive since capital has ceased to be delimited by geographical or physical borders and is now rather globalized.