Final answer:
Superagencies are large advertising agencies formed by consolidating smaller agencies in order to provide clients with effective supply chain management and just-in-time inventory management systems. Advertisers have the option to work with either superagencies or smaller agencies based on their needs. So, the correct answer is option E.
Step-by-step explanation:
Superagencies are large advertising agencies that are formed by the consolidation of smaller agencies. They aim to provide clients with effective supply chain management, just-in-time inventory management systems, and flexibility in their services. Advertisers may choose to work with superagencies or smaller agencies based on their specific needs and preferences. So, the correct answer is option E.