The correct answer is: B. unreliable
An elusive customer is a customer who is difficult to contact or deal with. They may be late for appointments, cancel appointments at the last minute, or not respond to phone calls or emails. They may also be difficult to please, and may change their mind about what they want or need frequently.
A clever customer is a customer who is intelligent and resourceful. They may be able to negotiate a good deal, or find ways to get what they want without paying full price.
A deceitful customer is a customer who lies or cheats. They may try to return items that they have used, or claim that they received damaged
goods when they did not.A quarrelsome customer is a customer who is easily upset or angry. They may argue with employees, or make unreasonable demands.
In the context of the question, the customer is described as “elusive.” This means that they are difficult to contact or deal with. This suggests that the customer is unreliable, as they are not keeping their appointments or responding to communication. The other options are not supported by the information in the question.