challenge: Who were the authors of the Occupational Personality Questionnaires (OPQ)?
  
  A. Galton, Cattell, and Eysenck
  B. Freud, Jung, and Pavlov
  C. Saville, Holdsworth, Nyfield, and Mabey, along with other researchers
  D. Bandura, Skinner, and Watson
  Answer: 