A megatrend<span> is a pattern or a movement which has a major impact on business and society as a whole. We group them into five </span>megatrends<span> – globalisation, demographic changes, technology changes and climate change and sustainability.</span>
Their share of the nation's income being much smaller than it was in 1970
is True.
In the 1970s , the lower class American's income was around 62 percent and
this has dropped to around 41 percent in recent times. The higher class
American's income however increased during the same period of time.
This is as a result of the increase in economic inequality of the country in
which the disparity between the income of the lower and higher class is very
wide.
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The correct answer here is D - Why. Whilst some of the other possible
answers here might need help from other scientists, in that to
understand when there may need to be dating methods from a scientist, or
to understand where the aid of a geologist might be needed, it is only
the why that might require help from other social scientists. For
example, anthropologists, sociologists and psychologists might be able
to help explain why a society was a certain way.
The answer to your question would be letter C.
