Final answer:
The theme described in the excerpt about Wealthy William is not explicitly stated and must be inferred; it deals with themes of the hollowness of excessive wealth, isolation, and the search for genuine happiness.
Step-by-step explanation:
The theme in the excerpt about Wealthy William is not explicitly stated in the text; instead, it is something that we, as readers, must infer. Themes are often underlying messages or central ideas that are communicated through characters, actions, and events within a story. In this case, the implied theme could relate to the idea that wealth cannot buy happiness or that opulence does not equate to emotional fulfillment. Another possible theme might be the isolation that can accompany great wealth, as indicated by the fact that William's parents were not present and he was left with only his au pair.
To correctly identify the theme, one must look deeper into the text and consider what lessons or messages can be drawn from William's experiences and the overall narrative. This process involves analyzing the characters, their motivations, and the consequences of their actions.