Final answer:
In the context of the text, 'vignette' means any small picture or illustration, which is option (D).
Step-by-step explanation:
The term vignette, as used in the provided text, refers to a specific kind of illustration. In the context of the sentence 'Engraving details have been added to the vignette, framing the Lincoln Memorial against a sky full of clouds,' the meaning of vignette aligns with the dictionary definition of 'any small picture or illustration.' Therefore, the correct answer is (D) any small picture or illustration. A vignette in literature or writing can also refer to a brief, evocative description, scene, or episode, serving as a snapshot or a focused moment in the narrative, which isn't the meaning implied in the context of the engraving detail in the question posed.
In the context of the text, the word vignette refers to a picture or illustration in a book (C). Engraving details have been added to create a visual representation of the Lincoln Memorial and the sky full of clouds.