Final answer:
Mean-spirited joking or sabotaging a co-worker is known as bullying, which encompasses repetitive and harmful behavior intended to cause distress or harm to another person. Correct answer is A. Bullying.
Step-by-step explanation:
Mean-spirited joking designed to highlight a co-worker's weaknesses or yelling at or sabotaging a co-worker is behavioral conduct known as bullying. Bullying includes repetitive negative treatment of another person that aims to inflict harm, injury, or humiliation, and can manifest in physical, verbal, or psychological forms.
In the workplace, this could also include actions aimed at sabotaging a co-worker's success or reputation. Specifically, in the context of aggression and prosocial behavior, they represent examples of aggressive and harmful interactions that counteract norms of positive social behavior. Correct answer is A. Bullying.