Step 1: "Astonishment" means a feeling of great surprise or amazement. The word "astonishment" is often used interchangeably with "surprise."
Step 2: Let's analyze the options:
- Punishment refers to a penalty or consequence, unrelated to astonishment.
- Sentiment refers to a feeling or emotion, but not directly linked to astonishment.
- Betterment means improvement, which is not synonymous with astonishment.
Step 3: "Surprise" is the correct synonym because it means the same as astonishment—being amazed or shocked.