Final answer:
John created a teaching tool for writing advertisements, which includes a series of guiding questions and is best defined as a structured writing prompt.
Step-by-step explanation:
John, an English teacher, has created a teaching tool for students to learn how to write a commercial advertisement for a soft drink product. The teaching tool includes a series of questions that guides students through the process of advertisement creation, considering the audience, use of visual logos, color choice, and communication medium. Based on the provided information and the elements included in this tool, it is most accurately defined as a structured writing prompt. A graphic organizer is more typically used for organizing ideas and information visually and would include elements like charts or diagrams. A rubric is a tool used to assess students' work against a set of criteria. A concept map visually represents relationships between different ideas or pieces of information.