I. In a sudden decision not previously intimated, India

Solution

II- India’s joining is an equally strong statement of commitment to Indo-Pacific goals, and to broadening regional economic cooperation, particularly after it walked out of the 15-nation RCEP. Here, since ‘joining’ is mentioned, the continuous tense should be used throughout and ‘broadening’ is correct here. IV- The four pillars also lend themselves to some confusion, drawing into question whether there is enough common ground among the 13 countries that are part of very different economic arrangements, as well as outliers, to set standards together, or be open to issues that vary for each country. Here, ‘whether…or’ is correct.