【单选题】

Which of the following best describes a "labor club," as defined in the passage
A．An organization to which Issei were compelled to belong if they sought employment in the Pajaro Valley

B．An association whose members included labor contractors and landowning "bosses"
C．A type of farming corporation set up by Issei who had resided in the Pajaro Valley for some time
D．A cooperative association whose members were dues-paying Japanese laborers