What was the liberum veto in the Polish-Lithuanian Commonwealth?

Answer and explanation

Correct answer: A. The right of a single deputy to stop the Sejm's proceedings

  1. Step 1: The Sejm worked by unanimity in the later Commonwealth. Step 2. Any one deputy could block it with the liberum veto. Answer: A single deputy could halt the Sejm. Why not the others: The other rights are different.

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