The object is a flat base slab with a stepped block (a middle block and a smaller wedge block on top of it) and a sloping ramp at the right. Looking along the arrow we see the slanted left face of the slab head-on, so the left of the drawing shows the stack of three levels: slab at the bottom, middle block above it and the top block above that, all lined up on the left half. The middle block has its own left face and front face, so a vertical edge appears inside the middle band, about a quarter of the way from the left. The slab shows its own vertical edge where its left face meets its front face, at about half the width, and this edge continues up as the right boundary of the tall stack. To the right of that edge the only thing above the slab is the ramp. The ramp starts at the top of the MIDDLE block (not at the top of the highest block) and slopes down to the top of the slab at the right end. Option 2 and Option 4 start the slope from the top of the highest block, so they are wrong. Option 3 puts the extra vertical edge in the bottom (slab) band instead of the middle band, so it is wrong. Option 1 has the edge inside the middle band, the full-height edge at half width and the slope from the middle level down to the slab, so it is correct. Answer: (1) Option 1
