Which of the following statement about the three-phase ratio index of the physical properties of soil is correct（ ）

A、Thevoidratioofthesoilwillneverbegreaterthan1;
B、Thewatercontentofthesoilistheratioofthemassofwatertothetotalmassofthesoil;
C、Thenaturalwatercontentandvoidratioofthesoilarethebasicindexesthatcanbedirectlymeasured;
D、Theporosityistheratioofthevolumeofvoidstothetotalvolumeofthesoil