Answer:
The hardest window to reach among the options provided is the "Clerestory" window.
Step-by-step explanation:
A clerestory window is located high on a wall, typically above eye level. It is designed to let in natural light without sacrificing privacy or wall space. Due to its elevated position, accessing and operating a clerestory window can be challenging, especially if it is positioned in a tall or hard-to-reach area of a building.
In contrast, the other window types listed, such as casement, awning, and sliding windows, are typically at more accessible heights and can be easily reached and operated.