Final answer:
The implied but missing step from the "Making of a President" article is B. Painting the background part of the display, which is crucial for providing context and depth to the portrait of George Washington.
Step-by-step explanation:
The question asks which step is implied but missing from the "Making of a President" article, referencing the process involved in developing representations of George Washington, such as paintings, sculptures, and other forms of artwork. Considering the context provided and the steps in the example of creating an artistic representation, the implied but missing step seems to be B. Painting the background part of the display. This step is crucial as it provides an appropriate setting which enhances the subject of the portrait, giving it depth and context. In the case of the George Washington artwork, like the Lansdowne Portrait, the background elements combined with the sitter's pose transformed it into an official state portrait through the incorporation of significant symbolic elements.