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) Each classification group in NAICS is heterogeneous in terms of the components used.
B) The geographic dispersion of firms cannot be identified with the help of NAICS.
C) The more the digits in an NAICS code, the more homogeneous the group.
D) Goods- or service-producing firms grouped under NAICS use different production processes.