Answer:

Introduction:
In the given question, we are asked about Gerrard's behavior upon encountering an intruder with a revolver in his hand. The correct answer is option 'B', which states that Gerrard remained calm. Let's discuss this answer in detail.

Explanation:
When Gerrard saw the intruder with a revolver, it is mentioned in the question that he remained calm. This means that he did not panic or show any signs of fear. Instead, he managed to stay composed and collected in a situation that could have potentially been dangerous.

Reasons for Gerrard's calm behavior:
1. Experience: Gerrard might have been in similar situations before, which helped him maintain his composure. He could have encountered dangerous situations in the past that taught him how to react calmly and think rationally.

2. Self-Control: Gerrard's calm behavior could be a result of his ability to control his emotions and remain level-headed in stressful situations. He might have learned to keep his emotions in check and think logically, even in threatening circumstances.

3. Assessment of the Situation: Gerrard's calmness could stem from his quick assessment of the situation. He might have analyzed the intruder's behavior, body language, and the environment to gauge the level of threat. This assessment might have led him to believe that the intruder was not an immediate danger, allowing him to remain calm.

4. Strategic Thinking: Gerrard's calm behavior could be a result of his strategic thinking. He might have realized that panicking or making sudden movements could escalate the situation and put him at greater risk. By remaining calm, he could have been preparing himself mentally to respond appropriately to the intruder's actions.

5. Self-Preservation: Gerrard's calmness could be a result of his instinct for self-preservation. He might have understood that staying calm and not provoking the intruder could increase his chances of staying safe. By showing fear or panic, he could have potentially triggered a violent reaction from the intruder.

In conclusion, Gerrard's calm behavior upon seeing the intruder with a revolver in his hand can be attributed to factors such as his experience, self-control, assessment of the situation, strategic thinking, and self-preservation instincts.