Final answer:
An extension ladder cannot exceed 40 feet under any condition. (option A)
Step-by-step explanation:
According to safety regulations and guidelines, an extension ladder should not exceed a certain length to ensure stability and prevent accidents. The correct answer is (A) 40 feet.
The limitation on the length of an extension ladder is based on safety considerations related to the ladder's stability and the potential for accidents. When a ladder exceeds a certain height, it becomes more prone to instability, increasing the risk of accidents, falls, or structural failure.
In adherence to safety standards and to mitigate the risks associated with ladder use, the maximum height for an extension ladder is set at 40 feet. It is crucial for individuals working with ladders to be aware of and comply with these safety guidelines to ensure a secure and hazard-free working environment. Therefore, option (A) 40' is the correct answer based on safety regulations governing ladder usage.