How did I manage to change his mind about the changes he opposed?

The choice that indicates the most effective method for changing someone's mind about their opposition is the approach of talking some sense into them. This suggests engaging in a discussion where reasoning and logical arguments are presented, allowing the person to understand the perspective and the rationale behind the changes. It's an approach that relies on communication, empathy, and understanding, fostering an environment where the individual feels heard and can reconsider their stance based on new information or insight.

In contrast, ignoring someone would likely lead to further entrenchment in their views, as they may feel disregarded and less inclined to change. Promising a reward could be seen as manipulative and may not address the underlying reasons for their opposition. Forcing someone to agree does not lead to genuine agreement or acceptance and could create resentment or further resistance. Engaging in a conversation offers a respectful and constructive way to encourage a change of mind that values the other person's opinions and feelings.