Which of the following would not interfere with conduit and cables inside a wall?

The choice of portable shelving as the correct answer indicates that this type of furniture is least likely to interfere with the conduit and cables inside a wall. Portable shelving is generally movable and does not have a fixed installation, which means it can easily be repositioned without disrupting any electrical installations. Unlike other items that may be mounted directly against the wall or require anchoring, portable shelving minimizes the risk of physical interference with the conduits and cables.

In contrast, suspended ceilings can create spaces where electrical installations might get overcrowded. Heavy furniture may place pressure on or inadvertently damage wiring if it is pushed against a wall. Wall-mounted fixtures, while sometimes necessary for lighting or decor, can require installation directly into the wall where conduit and cables reside, potentially affecting their integrity. Thus, portable shelving presents the least risk of interference with electrical components hidden within the wall structure.