Introduction:
In the given context, the son speaks for the first time, and we are asked whether he feels sad about the distance between them. The correct answer is option 'A' - Yes, he did feel sad about the distance between them. Let's explore the reasons behind this answer.

Explanation:

1. Understanding the context:
- The question implies that there is a distance between the son and someone else, possibly his father or someone close to him.
- The son speaking for the first time suggests a significant event or moment in their relationship.
- The question asks whether the son feels sad about this distance.

2. The significance of the son speaking for the first time:
- The son speaking for the first time indicates a breakthrough in their communication and connection.
- It implies that the son has been silent or unable to express himself verbally for a considerable period.
- Such a breakthrough is often emotionally charged and can lead to a range of feelings and emotions.

3. Emotional response:
- Given the significance of the son speaking for the first time, it is highly likely that he would feel various emotions related to the distance between them.
- The son might feel sad because the distance between them prevented him from expressing himself earlier.
- He might also feel sad because the distance signifies a lack of understanding, emotional support, or a strained relationship.

4. Unspoken emotions:
- The question suggests that the son might feel sad "in his heart," indicating that he may not openly express this sadness.
- The son's inability to communicate verbally in the past might have resulted in suppressed emotions.
- Hence, even if the son does feel sad about the distance, he might not have openly expressed or acknowledged it.

5. Conclusion:
- Considering the significance and emotional impact of the son speaking for the first time, it is highly likely that he feels sad about the distance between them.
- While the son's exact emotions may not be explicitly stated, the question implies that he does feel sad, reinforcing option 'A' as the correct answer.