Which of the following links the Commonwealth countries together?

The English language links the Commonwealth countries together. The Commonwealth is an organization of 54 member states, most of which were formerly under British colonial rule. English is the official language of the Commonwealth and is widely spoken across its member states. It is used for official communication, business, education, and other purposes. As a result, the English language plays an important role in linking the diverse Commonwealth countries and facilitating their interactions and cooperation.