8. The drawing shows a cross-section of a wall, with a shelf upright against it. By means of a hinge, the shelf can be folded upright against the wall. It can be let down to the horizontal, being held at point H by a rope, which is suspended from a hook, A, B or C. When the shelf is let down and supported by the rope, which hook is least likely to be pulled out of the wall? 1:) A '0 B Hooks \"Q C \"'9 \"a Wall r .0 H