Question

the treaty of versailles forced germany to
join the league of nations.
become part of france.
accept responsibility for the war.
provide better treatment of its colonies.

Explanation:

The Treaty of Versailles imposed "war - guilt" clause on Germany, forcing it to accept responsibility for causing World War I. Germany was not forced to become part of France, nor was providing better treatment of colonies a main requirement. And although Germany was later made to join the League of Nations, the most well - known and significant demand was the war - guilt clause.

Answer:

accept responsibility for the war.