It is difficult to say definitively, as all three areas are essential for human well-being. However, food sovereignty may be the most important, as food is essential for survival. Money and communication are also important, but they are not essential for survival in the same way that food is.
In the modern world, food sovereignty is still an important issue. Many countries rely on imports for a significant portion of their food supply. This can make them vulnerable to external shocks, such as crop failures or trade wars.
In addition, the global food system is increasingly dominated by a small number of multinational corporations. These corporations have a great deal of control over the food supply, and they can use this power to influence government policy and to shape consumer preferences.