Topic: Right Form of Verb,

Best Answer Explained in Below-:

The phrase "--- that I could be a young man again!" expresses a sentiment of longing or desire for a different reality. When analyzing the options provided, it is essential to look at how each word functions grammatically to convey this feeling.

**A) Were**: While "Were" can be used in a subjunctive construction (e.g., "If I were young"), it doesn't fit the sentence as a standalone statement that expresses desire.

**B) Had**: "Had" implies a conditional past and does not convey the hope of returning to youth. It could work in a sentence like "Had I known..." but not in this context.

**C) Might**: "Might" suggests a possibility or ability but lacks the direct expression of wish or desire implied in the sentence. Using "might" would change the sentiment.

**D) Would**: "Would" effectively conveys longing. In this context, it implies a hypothetical situation, encapsulating a wishful thought: "I would love to be young again." This aligns perfectly with the sentiment of regret or yearning for the past, making "would" the most appropriate choice.

In summary, "would" best fits the emotional tone of wishing for a different reality, making it the correct answer.