In recent years, Cuba has undergone some significant changes. Of the options provided, the most accurate answer is:
"It has allowed some private business and private property ownership."
Since the 1990s, Cuba has gradually allowed for limited private enterprise and ownership of property. This has led to the growth of small businesses and the emergence of a new middle class. However, the government still maintains control over most aspects of the economy, and political freedom remains limited.
While there have been some changes in Cuba's relationships with other countries, such as an improving relationship with the United States and a growing reliance on tourism, the statement "It has relied on many countries for aid rather than just one country" is not an accurate description of recent changes in Cuba.