The author’s claim that, since the mid-1970’s, a new strategy has emerged in the unionizat

ion of public-sector clerical workers (line 23 ) would be strengthened if the author______

A．described more fully the attitudes of clerical workers toward labor unions

B．compared the organizing strategies employed by private-sector unions with those of public-sector unions

C．explained why politicians and administrators sometimes oppose unionization of clerical workers

D．indicated that the number of unionized public-sector clerical workers was increasing even before the mid-1970’s

E．showed that the factors that favored unionization drives among these workers prior to 1975 have decreased in importance