For marketing materials such as business cards, brochures, pamphlets, and flyers to be effective, they...

 The most effective marketing materials are those that communicate the main message and value proposition of your organization and programs in a clear, concise, and compelling way1. State-of-the-art graphics and pictures may be attractive, but they are not essential and may even distract from the content. Including everything that describes your organization and programs may overwhelm the reader and make it hard to identify the key points. Targeting information for all your large audiences may dilute the impact and relevance of your message for each specific group. Therefore, the best option is D, clear, concise written material. References: 1: CESP Candidate Handbook, page 17.