Final answer:
Stefano's situation best fits the option of role change and dissatisfaction, as he is experiencing added responsibilities not aligned with his initial job role leading to work overload and job stress.
Step-by-step explanation:
The situation Stefano is facing involves a role change and dissatisfaction. Stefano was initially hired as a lifeguard, but the additional responsibilities of mowing grass and cleaning out locker rooms, which were not part of his initial job description, have caused him distress. The added tasks represent a shift in role expectations and have led to feelings of work overload. When employees perceive that the demands of their job exceed their capacity to meet them, they may experience job stress, which can adversely affect job satisfaction and potentially lead to job burnout.