During lightning, which of these structures would most benefit from a lightning conductor?

Options

A. A 40-storey building
B. A one-storey house
C. A small tree
D. A garden

Answer

To determine which structure would most benefit from a lightning conductor during lightning, we need to analyze the options provided.

### Step-by-Step Solution:

1. **Understanding Lightning Strikes**: Lightning tends to strike tall structures because they provide a shorter path for the electrical discharge to reach the ground. The higher the structure, the greater the likelihood of a lightning strike.

2. **Identifying Structures**: In the question, we are given a 40-story building as one of the options. We need to consider how tall this structure is compared to other potential structures.

3. **Evaluating the 40-Story Building**: A 40-story building is significantly tall and would be one of the highest structures in an urban environment. This height increases its chances of being struck by lightning.

4. **Conclusion**: Since the 40-story building is the tallest structure among the options provided, it would most benefit from a lightning conductor. A lightning conductor helps to safely direct the electrical discharge from a lightning strike into the ground, thereby protecting the structure from damage.

### Final Answer:
The structure that would most benefit from a lightning conductor during lightning is the **40-story building**.