The intruder was a criminal.

The correct answer to the question is option 'B', which states that the intruder was a criminal. Let's discuss why this answer is correct in detail.

Explanation:

- Definition of an intruder: An intruder is someone who enters a place without permission or unlawfully. In this scenario, the question assumes that someone entered a place without authorization, making them an intruder.

- Options a, c, and d: The other options presented in the question are a thief, a priest, and a soldier, respectively. Let's analyze why these options are not correct:

a) a thief: A thief is a person who steals things. While it is possible for a thief to be an intruder, the question does not provide any information about the intruder's intention or actions. Therefore, it cannot be determined whether the intruder was a thief or not.

c) a priest: A priest is a religious leader who typically serves in a place of worship, such as a church. It is highly unlikely for a priest to be an intruder, as they usually have lawful access to the premises they serve.

d) a soldier: A soldier is a member of a military force. Unless this scenario involves a military operation or conflict, it is unlikely for a soldier to be an intruder.

- Option b: The correct answer, option 'B', states that the intruder was a criminal. This option is the most suitable because it encompasses a wide range of illegal activities that can be associated with an intruder, such as burglary, trespassing, vandalism, or any other criminal act.

In conclusion, the intruder in this scenario is identified as a criminal because they entered the place without permission or unlawfully. While the exact nature of their criminal activity is not specified, it is clear that their actions were illegal.