The plan shows four bars: three narrow bars tilted to the line of sight and one rectangular bar at the top right, parallel to the picture plane and farthest from the observer.
Seen from the arrow side, each tilted bar shows two faces (its end face and its long side face) separated by one vertical edge lying roughly in the middle of its width. So every tilted bar must appear as a box divided into two parts by one vertical line.
The far rectangular bar has no tilted edges, so it appears as a plain rectangle with no vertical line inside. It starts above the middle tilted bar, is partly hidden behind the middle and right bars, and its right end projects beyond the right bar.
Option (1) places the dividing edge of the left bar near its left end, which is wrong. Option (2) draws a vertical line through the far rectangle, which is wrong because that bar has no visible edge. Option (4) shows the middle bar without its dividing edge. Option (3) shows each of the three tilted bars divided in two with the edge near the middle, and the far bar as a plain rectangle that is correctly hidden behind them.
Answer: (3) elevation (3)