How should a ground ladder be positioned for access to a second-story window?

How should a ground ladder be positioned for access to a second-story window?

• A. Base right against wall; never extend; single point of contact.
• B. Base two to four feet from the wall (about 1/4 of ladder length); extend to window; maintain three points of contact.
• C. Base ten feet from wall; extend only halfway.
• D. Base two to four feet from wall; do not extend to window.

Answer: (B)