It is a type of statistical hypothesis that suggests a negative correlation between variables

the lake is the bhopal lake

c it has to be i googled it

no because it could make the world a terrible place to live in.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.