Correct Answer: Wonder

Solution : The correct choice is the first option.

Astonishment refers to a feeling of great surprise or amazement. In this context, wonder is the most appropriate synonym, as it also conveys a sense of awe or surprise.

The meanings of the other options are as follows:

• Composure refers to a state of being calm and composed.
• Fright refers to a state of being scared or frightened.
• Expectation refers to a state of anticipating something.