The correct answer is A) international investments and trade in currencies.
The words or phrases that could be placed along with the fuse in the cartoon to indicate how global events could ignite the firecrackers are "International investments and trade in currencies."
Globalization has brought many advantages to world countries. But one of the disadvantages, when economic issues arise, is that world economies are interconnected to the degree that what happens in one country affects the others. If the US stock market has a bad day it impacts other stock markets in the world. So as in the case of the cartoon attached, international investments and trade in currencies can unleash economic consequences like the ones depicted in the cartoon. That is why "Moodys" or "Standard & Poors" are always aware of what happens in every country regarding trade and investments.
