C. establishment of a political union of member nations
In Uttarakhand in northern India
"The Six Days War" against Egypt. and Syria
Answer:
Global temperatures; in the past half-century.
Explanation:
The graph of the global temperatures in the northern hemisphere was more or less costant until it spiked very hard in the past half-century. Therefore, it is called the "hockey stick" chart because its shape resembles a hockey stick. The original graph was made, as the exercise details, by Michael Mann and his colleagues in 1999.
Its maybe B or C. I think it is B.
