Answer:
b. Accurately following the specified treatment plan designated for your client's observed ethnic group.
Step-by-step explanation:
When trying to gain the trust if a customer that is culturally different from you, a wrong tactic can be trying to accurately follow a treatment plan or generally accepted way of treating his ethnic group.
This might result in the customer feeling offended and feel one is trying to use ethnicity in your interaction.
It is best to better to treat the customer without bias to his ethnic group, and focusing on how to effectively explain your business methods to him.