Which of the following statements is TRUE?
选项：

A:Tai chi, xingyiquan and baguazhang are regarded as 3 representative categories of neijiaquan boxing.;
B:According to wuxingquan, heart corresponds to water.;
C:Southerners are good at using legs while the northerners are good at using the fists.;
D:Tai chi is made up of eight footwork moves and five hand moves.