Answer :

When setting up a ladder correctly and safely, it's important to position the base of the ladder at an appropriate distance from the wall or vertical surface. The correct proportion for setting up a standard ladder is that for every 3 feet of elevation (vertical height), the base of the ladder should be set 1 foot away from the wall.

This ratio ensures that the ladder has the proper angle and stability, reducing the risk of it slipping away from the wall or being too steep, which can be dangerous.

Given the options:
A) 2
B) 4
C) 3
D) 5

The correct choice is C) 3.

Thus, for every 3 feet of the ladder's elevation, the base should be 1 foot away from the wall. This helps to maintain the ladder's stability and safety during use.