Step 1: Understanding the Concept:
This is an analogy question where the relationship between the words is one of opposition.
Step 2: Detailed Explanation:
The relationship between STUPOR and ALERT is that they are antonyms. A stupor is a state of near-unconsciousness or insensibility, the opposite of being alert, which means quick to notice and react.
Now let's analyze the answer choices to find another pair of antonyms:
\begin{itemize}
\item (A) rebellion: defiant - Being defiant is a characteristic of a rebellion. These are related concepts, not opposites.
\item (B) despair: hopeful - Despair is the complete absence or loss of hope. Being hopeful is its direct opposite. This is a perfect antonym pair.
\item (C) expectation: unfulfilled - An expectation can be unfulfilled, but they are not opposite states.
\item (D) circumspection: careful - These words are synonyms. Circumspection means being wary and careful.
\item (E) ennui: listless - These words are synonyms. Ennui is a feeling of listlessness and dissatisfaction.
\end{itemize}
Step 3: Final Answer:
The pair "despair: hopeful" has the same antonym relationship as "stupor: alert".