Final Answer:
Pair of sentences 2 completes the diagram showing the course of the French Revolution: "French society is divided into estates. France implements the Napoleonic Code."
Step-by-step explanation:
The course of the French Revolution is outlined chronologically through key events:
The division of French society into estates signifies the pre-revolutionary period, where social inequality and discontent were prevalent.
The implementation of the Napoleonic Code, representing Napoleon Bonaparte's rule, is a significant post-revolutionary development that standardized laws in France.
Options 1, 3, and 4 are not in chronological order or context:
Option 1 refers to the early phase of the revolution, but its second sentence is unrelated to the Reign of Terror.
Option 3 discusses events after the Reign of Terror without a clear link to the Napoleonic Code.
Option 4 connects the Napoleonic Wars with the National Convention but lacks chronological coherence.
Option B is the answer.