Question econom

3.3 Transitions - Cause–effect transitions (therefore, thus)
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Economist Elinor Ostrom’s studies of communities around the world have empirically demonstrated that common pool resources, such as grazing lands, can be sustainably managed by the people who use them (rather than through private entities or centralized governments). blank Ostrom’s work is a repudiation of the “tragedy of the commons,” the view that individuals will inevitably overexploit a finite shared resource if given unfettered access to it.  

Which choice completes the text with the most logical transition?

A.

For example,

B.

By contrast,

C.

That said, 

D.

As such,