Select the correct type of line used in construction drawings to refer to an object's center.

The center line is specifically designed to represent the center of objects in construction drawings. It is a critical element used to indicate symmetrical features, communication of the axis of parts, and to facilitate precise layouts and alignments in construction projects. Often depicted as alternating long and short dashes, the center line helps professionals easily identify key dimensions and locate openings or features symmetrically along an object or structure.

In contrast, a phantom line represents objects that are not currently present or to indicate alternate positions of moving parts, which does not serve the same purpose as a center line. A hidden line shows edges not visible from the current view and is denoted by a series of dashes. A construction line, typically light and often used for preliminary drawings, serves as a guideline for setting other elements but does not convey information about the center of an object. Therefore, the center line is the appropriate choice for indicating an object’s center in construction drawings.