Your contractor's license number must appear in or on all the following advertisements except ________.

The requirement for a contractor's license number to appear in advertisements stems from regulations that ensure accountability and consumer protection. In many cases, advertising mechanisms that are less formal, such as free yellow page listings, may not be subject to stringent requirements. This means that while it's advisable to include the license number for transparency, it is not strictly mandated for these listings.

In contrast, the other options involve business interactions or promotional materials where the presence of a contractor's license number is essential. Business proposals and coupons typically act as formal offers and agreements, necessitating clear identification of the service provider's credentials. Business cards are also a direct representation of the contractor's business and are expected to carry license information to establish legitimacy. Thus, while the inclusion of the license number enhances credibility, it isn't a compulsory requirement for less formal advertising formats like free yellow page listings.