Answer the questions based on the following passage:

All proponents of human security agree that its primary goal is the protection of individuals. However, there are differences about precisely what threats individuals should be protected from. Proponents of the 'narrow' concept of human security focus on violent threats to individuals or, as former UN Secretary-General Kofi Annan puts it, "the protection of communities and individuals from internal violence". Proponents of the 'broad' concept of human security argue that the threat agenda should include hunger, disease and natural disasters because these kill far more people than war, genocide and terrorism combined. In its broadest formulation, the human security agenda also encompasses economic security and 'threats to human dignity'. Put differently, the broadest formulation stresses what has been called 'freedom from want' and 'freedom from fear', respectively. The idea of global security emerged in the 1990s in response to the global nature of threats such as global warming, international terrorism, and health epidemics like AIDS and bird flu and so on. No country can resolve these problems alone. And, in some situations, one country may have to disproportionately bear the brunt of a global problem such as environmental degradation. For example, due to global warming, a sea level rise of 1.5-2.0 meters would flood 20 percent of Bangladesh, inundate most of the Maldives, and threaten nearly half the population of Thailand. Since these problems are global in nature, international cooperation is vital, even though it is difficult to achieve.

Why is 'global security' important?

No country can resolve problems like global warming, international terrorism and health epidemics alone.

The correct answer is Option (3) → No country can resolve problems like global warming, international terrorism and health epidemics alone.

The passage explicitly states that the idea of global security emerged in response to global threats such as "global warming, international terrorism, and health epidemics like AIDS and bird flu and so on." It then directly explains why global security is important by stating, "No country can resolve these problems alone." It further supports this by mentioning that some countries may have to disproportionately bear the brunt of these global issues.