How can a Combination Ladder be used?

A Combination Ladder is versatile in its design and functionality, making it suitable for various applications. It can be used as a single ladder, allowing it to function in situations where a standard straight ladder may be needed. Additionally, it can transform into an extension ladder, which provides increased height for accessing elevated areas like rooftops or high windows. Furthermore, the A-frame configuration allows for stability and support when the ladder is positioned against a surface, making it effective for tasks that require the user to work at a stable height.

This multifunctionality is what makes the B option the correct answer, as it encapsulates all these potential uses of a Combination Ladder, catering to different scenarios firefighters may encounter during their operations. Understanding this versatility is crucial for effective emergency response and achieving operational efficiency.