Which of the Below Statements Is TRUE

Which of the below statements is TRUE?

A) Because of differences in culture and history, different countries regulate financial markets and financial institutions in varying ways, emphasizing some forms of regulation more than others.
B) The standard explanation or justification for governmental regulation of a market is that the market, left to itself, will produce its particular goods or services in an efficient manner and at the lowest possible cost.
C) Governments in most developed economies have created elaborate systems of regulation for financial markets, in part because the markets themselves are simple and in part because financial markets are unimportant to the general economies in which they operate.
D) Financial activity regulation are free of rules about traders of securities and trading on financial markets.