Correct Answer: Goodness gracious

Solution : The correct choice is the fourth option.

Explanation: "Goodness gracious" is an exclamation used to express surprise, shock, or concern in a more emphatic and sometimes slightly dramatic manner. In the given context, the speaker is expressing astonishment or concern about the odd appearance of the person's hair. This phrase fits because it conveys a sense of surprise and mild alarm at the unexpected change in the person's appearance.

Therefore, the complete sentence would be: Goodness gracious! What have you done to your hair? You are looking so odd.