Correct Answer: exposed

Solution : The second option is the correct choice.

Vulnerable means weak and without protection, with the result that they are easily hurt physically or emotionally. Exposed means to be deprived of shelter, protection, or care; subject to risk from a harmful action or condition.

The meanings of other words are as follows:

• Guarded means to be cautious and have possible reservations.
• Secure means to make sure something is protected from danger or threat.
• Protected means to preserve or cover from harm.

Therefore, the right answer is exposed .