Question

Services depend on the people who provide them. as a result, their quality varies with each person's capabilities and day-to-day job performance. this element of services is referred to as __________.

Answer 1

Inconsistency.

Humans aren't perfect so their services will naturally vary and not always be consistent.

This is one of the "4 i's" of service (inconsistency, intangibility, inseparability, and inventory)  or 4 elements that make services different from goods.