Which activity signifies a person is engaged in the business of selling motor vehicles?

Engaging in the business of selling motor vehicles is typically defined by the frequency and consistency of sales activities, as well as the location where these transactions occur. The correct answer reflects a threshold that indicates a more established and habitual practice of selling vehicles.

Selling three or more vehicles at the same address in a year demonstrates a level of activity that goes beyond casual transactions. This establishes a pattern of behavior that aligns with being a dealer, as it shows an ongoing intent to sell vehicles rather than just occasional sales. This volume and consistency are often used to determine whether an individual or entity should be classified as a motor vehicle dealer according to regulatory definitions.

The other options do not meet this standard. Selling one vehicle per month may not indicate a business but could simply be personal transactions. Selling three or more vehicles at different locations involves multiple sites which could complicate the determination of a 'business' without confirming sustained activities at any single site. Advertising vehicles without selling does not demonstrate any engagement in the selling process and does not contribute to the definition of one's involvement in the business of selling motor vehicles.