A local union may represent all of the following except:

A) Many workers from a single workplace.
B) Workers in a single occupation from several workplaces.
C) Multiple occupations in multiple workplaces.
D) Workers in a single occupation already represented by an industry union.

A local union generally represents workers in a specific occupation from various workplaces or workers from a single workplace. However, if there is already an industry union representing workers in a particular occupation, then a local union cannot represent them. Therefore, option D is incorrect as local unions cannot represent workers in a single occupation already represented by an industry union.