Correct Answer: Relax

Solution : The correct choice is the third option .

Explanation:

Fret typically refers to feeling anxious, distressed, or worried. The opposite of this emotional state is to be relaxed, indicating a lack of stress or anxiety. Therefore, relax is the antonym that best conveys the opposite meaning in the given context.

The meanings of the other options are as follows:

• Anxious: feeling worried, uneasy, or nervous about something.
• Anguish: severe mental or physical pain, distress, or suffering.
• Pine: to yearn intensely or suffer a lingering illness or decline.