Which geopolitical risk do investors fear the most?

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The rise of the Islamic state, ongoing tensions between Ukraine and Russia and simmering territorial disputes between China and its neighbors are just a handful of geopolitical concerns that have been causing alarm among investors.

In January, the World Economic Forum named international conflict as the biggest risk for the global economy. In March, a joint statement by the heads of the World Bank, International Monetary Fund, World Trade Organization and Organization for Economic Co-operation and Development warned of the "significant burden" on economic development as a result of geopolitical tensions.

Which of the following do you view as the biggest threat to the global economy?