The last sentence contributes to the development of the MAIN idea of the paragraph because it describes the revolution as the effect of a combination of different factors.
The fragment presented describes the privileged situation of Europe that allowed it to interact with the other regions of the world easily due to its location.
Europe remains at the "center" of market and exchange flows between Asia, America, and Africa. This dynamic caused it to be influenced by other cultures, which allowed it to develop scientific revolutions.
Accordingly, the last sentence of the fragment serves to illustrate the result of the favorable location conditions that Europe had concerning the other regions.
So the correct answer is C because it illustrates the main effect of a combination of different factors.
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