The correct option is B 30 years
Internet the revolutionary communication and networking system , completed three decades of its existence on January 1, 2013. According to the Internet Worlf Statistics , there were only 361 million Internet user in 2000, in the entire world. In 2012 , the number of Internet users worldwide reached 2.27 billion, almost exactly twice what it was in 5 years ago ,1.15 billion.