Which service offers avoidance advice in addition to traffic information?

The choice of Deconfliction Service is appropriate because it is specifically designed to provide pilots with avoidance advice in addition to general traffic information. This service aims to minimize the risk of mid-air collisions by advising on potential conflicts and suggesting alternative flight paths or maneuvers to maintain safe separation between aircraft.

In contrast, Traffic Service primarily focuses on providing traffic information to pilots without direct avoidance guidance, while Alerting Service is intended to notify appropriate authorities or services when an aircraft goes missing or is in distress, lacking avoidance counseling. Procedural Service involves managing air traffic through defined procedures, but it does not typically include real-time conflict avoidance advice. Therefore, Deconfliction Service uniquely addresses both the awareness of nearby traffic and the proactive measures to avoid potential collisions, making it the correct answer.