Explanation:

Fourth option is correct.

Recently, at the Wuhan Informal Summit, the China-India Plus X model was introduced for engagement with development of the Africa region.

The first Informal Summit between Prime Minister Narendra Modi and China’s President Xi Jinping was held in Wuhan. The purpose of meeting was to exchange views on overarching issues of bilateral and global importance and to elaborate their respective visions and priorities for national development in context of current and future international situation.