Final answer:
The background section in the Vision and Scope document summarizes the rationale and context for the new product or changes to an existing one.
Step-by-step explanation:
The correct statement that describes the background section in the template of a Vision and Scope document is D. The background summarizes the rationale and context for the new product or for changes to be made to an existing one. It describes the history or situation that led to the decision to build.