Pierre de Coubertin is who this is, ask me anymore questions if needed.
It allowed them fewer ships than the US and Britain limiting the kind of parity they hoped to have on the world stage in terms of naval power.
One of the arguments went that the US and Britain had to have larger navies because of their need to maintain a force in more than one operating theater while the Japanese only had to worry about their side of the Pacific. It wasn't something that made a number of hardcore military types within the Japanese leadership very happy, but they ended up signing the treaty anyway (though refused to renew it in the 1930s).
All of the following developments in Germany during the 1930s (the construction of fortifications along the Rhine River, the annexation of Austria, and the resumption of the military draft to create a large army) were violations of the Treaty of Versailles, except D) the return of the Saarland to German control.
Upton Sinclair's novel, The Jungle, was written to show the world how cruelly and harshly immigrants in industrialized cities were treated in the early twentieth century. At first, the claims that Sinclair made in his novel were thought to be outlandish and over exaggerated. However, when government officials actually looked into the claims, they found that conditions were even worse than what Sinclair had said. Hope this helps.