Final answer:
Part-time employees who have worked for 5 years continuously are eligible to enroll in the Tuition Assistance program.
Step-by-step explanation:
The subject of this question falls under Business.
The correct option for enrolling in the Tuition Assistance program upon completion of a certain period of continuous service with the city is Option D: Part-time employees, 5 years.
This means that after working part-time for a city job for 5 years continuously, an employee would be eligible to enroll in the Tuition Assistance program.