Where should you stop at a corner with a stop sign?

Answer: A — At the crosswalk

When you reach a corner with a stop sign, you must come to a full stop at the boundary where the crosswalk begins—the stop line or the edge of the crosswalk. Stopping here gives you a clear view of cross traffic and any pedestrians, so you can yield the right of way safely before entering the intersection. After stopping, only proceed when the way is clear and it’s safe to do so. Stopping past the crosswalk or in the middle of the intersection puts you into the path of traffic or pedestrians and is unsafe and not allowed.