Which Statement BEST Describes the Finding of Stajkovic and Luthan's

Which statement BEST describes the finding of Stajkovic and Luthan's (1997) meta-analysis on organizational behavior management (OBM) ?

A) Companies that used OBM experienced significant performance improvements.
B) Companies that used OBM found that subjective performance increased, while objective performance decreased.
C) Approximately 50% of companies found that OBM damaged performance.
D) OBM appears to have no meaningful effect on performance.