A

Step 1: Identify the heating effect.
When the water at point A (above the lamp) is heated, it expands and becomes less dense than the cooler water at point B. This causes the water at point A to rise.
Step 2: Understand fluid dynamics.
As the warmer, less dense water rises, it creates a low-pressure area at point A. Water from point B, which is cooler and denser, then moves to fill that space.
Step 3: Analyze the circulation.
This process will create a continuous cycle, or convection current, where warmer water rises and cooler water sinks, resulting in a counter-clockwise circulation pattern in the closed tube.
Therefore, the correct answer is A.