Answer:
B) flextime
Step-by-step explanation:
Flextime refers to a flexible work schedule, where employees are required a minimum amount of work time per day, and as long as they complete a minimum required amount of work performed during that time.
In this case, Marta is required to be at work between 10 am to 2 pm, she probably at a restaurant and needs to be there at lunch time. Marta probably is a part-time employee, since she only needs to work 4 hours per day.
Even though employers allow a lot flexibility with flextime work, they generally require that employees work a similar amount of hours per day than normal work schedules, e.g. a full time employee must work at least 40 hours per week.