Personal trainers cannot complete their work without their clients because of the inseparability feature of services. Thus, option c is correct.
Personal trainers refer to trainers who are dedicated to only a single student or client, and their work is centered around the student. They are not supposed to guide any other client.
If the student is not present due to some reason, the trainer cannot work. The personal trainer and her student are inseparable. Both of them need to be present to fulfill the work. Thus, they share the feature of inseparability.
The other features, like perishability, intangibility, heterogeneity, and tangibility, are not relevant to the trainer-student relationship. These features do not affect the relationship between a trainer and her student if one of them is absent.
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The complete question is given below:
Personal trainers cannot complete their work without their clients present because of the _______ feature of services.
a) perishability
b) intangibility
c) inseparability
d) heterogeneity
e) tangibility