Correct Answer: Turbulent

Solution : The correct choice is the first option.

The antonym for placid is turbulent . Placid describes a calm and peaceful state, while turbulent characterises a state of conflict, disorder, or agitation.
The meanings of the other options are as follows:

• Pensive means engaged in deep thought or contemplation.
• Pristine means in its original condition, unspoiled or untouched.
• Destined means intended for a particular purpose.

Therefore, the correct answer is turbulent.