Which of the following is a requirement for a petition to revive a trademark application?

The requirement for a petition to revive a trademark application is the inclusion of an unintentional delay statement. This statement is crucial because it affirms that the applicant did not intentionally abandon the application. The USPTO recognizes that delays can occur for various reasons and seeks to ensure that applicants have the opportunity to pursue their trademark registrations even after a lapse in action.

In the revival process, the statement serves to clarify that the applicant wishes to proceed with the application despite any circumstances that may have led to its abandonment. This policy supports applicants who may have encountered unforeseen issues that prevented them from responding in a timely manner.

The other options, while they may touch on aspects of the trademark application process, do not satisfy the specific requirement for reviving an abandoned application. For instance, a signed declaration from an attorney may be necessary for some applications but is not a stipulated requirement for revival. Similarly, proof of market demand or a detailed response to an office action is not needed in this context, as the focus is solely on the unintentional nature of the delay.