Why is the Tennis Court Oath linked with constitution making?

Because representatives swore not to separate until a constitution was made

The governing concept is the emergence of popular sovereignty and constitutional government during the French Revolution. On 20 June 1789, representatives of the Third Estate found their meeting hall closed and assembled in an indoor tennis court. There they took the Tennis Court Oath, promising not to disperse until France had a constitution. The oath transformed a dispute about the Estates General into a determined political movement for a written constitutional order and helped establish the National Assembly’s claim to represent the nation. Thus option B is correct. The other choices confuse the venue with unrelated events: no coronation, Bastille attack, or Church-tax collection occurred there.

This is a Class 9 History question. Chapter: The French Revolution. Topic: The Outbreak of the Revolution.