The Troppau Memorandum,which was signed by Russia,Prussia,and Austria,called upon the signatories to aid one another:

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The Troppau Memorandum was signed in 1820 by Russia, Prussia, and Austria. It stated that the signatories would aid one another in suppressing revolution. The document declared that any state that faced revolution would be considered a threat to the security of other European states and that the international community should take action against it. Therefore, the correct choice is D.

The Troppau Memorandum,which Was Signed by Russia,Prussia,and Austria,called Upon the Signatories