He congratulated me on my grand success.
Explanation:
- Thanked: This means to express gratitude or appreciation. While it's a positive response, it might not capture the full extent of acknowledging someone's achievement like "congratulated" does.
- Amazed: This means to be greatly surprised or impressed by something. While it could be a positive reaction, "congratulated" is a more appropriate response for acknowledging a success.
- Congratulated: This is the most suitable option. It means to express warm approval and pleasure to someone for their achievement or good fortune.
- Welcomed: This means to greet someone with warmth and hospitality. While it's a positive reaction, it's not the most appropriate response in this context, as it doesn't directly address the grand success.
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