Prior to the 1930s,union Membership Growth Was Relatively

Prior to the 1930s,union membership growth was relatively:

A) slow,due to the use of blacklisting,injunctions,and yellow dog contracts
B) slow,due to the widespread use of lockouts and strikebreakers authorized under the Norris-LaGuardia act
C) rapid,due to the favorable court treatment of union activity provided by passage of the Sherman Act of 1890
D) rapid,due to favorable court interpretations concerning workers' property rights