Final answer:
The law of effect suggests that to encourage Mo Chou to repeat the behavior of finishing work early, her boss should provide praise for her efforts, as positive reinforcement can lead to an increase in the likelihood of such behavior reoccurring.
Step-by-step explanation:
If Mo Chou's boss would like her to repeat the behavior of completing her work assignment early, the appropriate action according to the law of effect would be to provide praise for her efforts.
The law of effect states that behaviors followed by positive consequences will become more likely to occur, while behaviors followed by negative consequences will become less likely.
In Mo Chou's case, positive reinforcement through praise can increase the likelihood that she will continue to complete assignments ahead of schedule.