Which of the following statements is true when considering national banking structures around the world?

A$.$ Due to free markets in the banking industry, banking fees vary marginally around the world.

B$.$ Most countries have only a few large banks.

C$.$ It is the case that in nearly all industrialized countries the largest $5$ banks in a country generally hold over $75\%$ of a country's assets.

D$.$ U$.$S$.$ businesses only obtain approximately $30\%$ of their funds from bank loans compared to $65\%$ for European firms.