The correct answer is option 'C' - Frightened.

Explanation:

Setting the scene:
The sentence states that the lights went out suddenly, and the person was alone. This sets a tone of uncertainty and vulnerability.

Understanding emotions:
To determine the correct answer, we need to understand the emotions that the person might experience in such a situation. Let's consider each option:

a) Worried:
Being worried implies feeling concerned or anxious about something. While it is possible for the person to feel worried in this situation, it may not be the strongest or most immediate emotion that arises.

b) Shocked:
Being shocked means feeling surprised or taken aback by something unexpected. It is natural to feel shocked when the lights suddenly go out, especially if it happens unexpectedly. However, being shocked alone may not capture the complete emotional response that the person is likely to experience.

c) Frightened:
Being frightened means feeling scared or afraid. When the lights go out suddenly, especially when someone is alone, it can create a sense of fear or vulnerability. The person may feel scared of the darkness, unsure of what caused the power outage, or concerned about potential dangers. This emotional response seems more appropriate given the given scenario.

d) None of these:
The option 'd' states that none of the given options are correct. However, based on the situation described, it is clear that the person is likely to experience some kind of emotion, and the most fitting one is feeling frightened.

Overall, considering the sudden power outage and the person being alone, the most appropriate emotional response in this scenario would be feeling frightened.