What ground could lead to the denial of a motor vehicle salesperson's license?

The correct answer is grounded in the principle that a motor vehicle salesperson must possess a certain level of integrity and moral character to perform their duties appropriately. Unfitness of character reflects a situation where an individual may have a history of dishonest behavior, fraud, or other unethical practices that signify they are not suitable to hold such a license.

This concept is vital in the sales industry, particularly in automotive sales, where trust between the salesperson and the customer is fundamental to the success of the transaction. Licensing authorities assess the character of applicants to ensure that they will adhere to ethical business practices and provide honest service to consumers.

Other choices, such as enthusiasm for sales, creative marketing techniques, and high customer satisfaction ratings, do not present any basis for denial of a license. In fact, enthusiasm and creativity can be beneficial traits that contribute positively to a salesperson's effectiveness. Meanwhile, high customer satisfaction ratings typically indicate good performance and integrity in customer dealings, which are favorable in the eyes of licensing bodies.