D. They gave Japan control over some former German possessions in China.
Explanation:
When World War I began Japan seized the territory Germany had in China and the German islands in the Pacific north of the equator.
Japan did a secret agreement with the allies powers except the United States to guarantee the annexation of those territories.
Article 156 of the Treaty of Versailles transferred German concessions in Jiaozhou Bay to Japan rather than returning the sovereignty to China. The Chinese delegation demanded that a reservation be inserted before sign the Treaty. It was denied so the Treaty of Versailles was signed by all delegations except China.
