The moment arm maximum in a door is A) from handle of door
Why is this the moment arm is maximum ?
The moment arm, also known as the lever arm, is the perpendicular distance from the axis of rotation - in this case, the door h-i-n-g-e - to the point where a force is applied.
When you push or pull a door to open or close it, the point at which you apply the force is typically the handle of the door. The moment arm is the distance from the h-i-n-g-e - the axis of rotation - to the handle.
In contrast, the corners of the door do not represent the maximum moment arm because they are closer to the h-i-n-g-e , and the distance from the h-i-n-g-e to the corners is shorter than the distance from the h-i-n-g-e to the handle.