Which of the Following Statements Is True of the North

Which of the following statements is true of the North American Industry Classification System (NAICS) ?

A) The system developed jointly by United states,Russia,and Mexico,provides a common industry classification system .
B) The geographic dispersion of firms cannot be identified with the help of NAICS.
C) The more digits in an NAICS code,the more homogeneous the group.
D) Each classification is relatively heterogeneous in terms of raw material required,components used,and manufacturing processes employed.