d. The taking of the tennis court oath by members of the third estate in 1789
Explanation:
- The third estate decided on a radical move, they declared themselves the National Assembly and invited the other estates to join them.
- After a few days, when they were scheduled to hold their first meeting, their hall was locked.
- They went to a nearby indoor tennis court, where they were joined by a considerable number of representatives of the first two classes.
- At the tennis court, they vowed not to break up until France was given a constitution.
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