Answer:
Letter b is correct. Intangibility.
Step-by-step explanation:
Phillip Kotler has defined the intangibility of services as one that unlike a physical product cannot be touched, seen and tasted before it is purchased.
Therefore, every service is intangible, but there are elements that aid in better insight and evidence about what a customer should expect about a service.
Service marketing is a strategy that helps in the perception of tangible elements of a service, but these elements are related to feelings and perceptions, what they guarantee is the increased reliability about a given service.
Every service works with the inseparable dynamics of production and consumption, that is, no matter how much marketing efforts are made to make it more reliable, only the fulfillment of the service itself will be the criterion to establish the conformity expected by the consumer.