Answer: Wearing high status clothing
Explanation: In simple words, Non verbal communication refers to the act of making any remark or statement without using language. It could be done by using body posture, dressing sense or eye contact etc.
In the given case, James tried to persuade his clients by showing that he belongs to the high class of the society and maintains a high status. He did so by wearing the expensive clothes. Such persuation will result in perception that James is hardworking and trusted.
Hence from the above we can conclude that the correct option is B.