A three-dimensional drawing that depicts the plumbing system is called a __ A. structural plumbing drawing B. plumbing isometric drawing C. 3-D plumbing drawing D. plumbing plan

The correct answer is B. plumbing isometric drawing.<br /><br />A plumbing isometric drawing is a three-dimensional representation of a plumbing system. It provides a visual representation of the plumbing components and their spatial relationships within a building or structure. This type of drawing is commonly used in construction and engineering projects to help designers, engineers, and contractors understand the layout and functionality of the plumbing system.<br /><br />Option A, "structural plumbing drawing," is not a commonly used term in the industry. Option C, "$3-D$ plumbing drawing," is a general term that could refer to any three-dimensional representation of a plumbing system, but it does not specifically indicate the isometric perspective. Option D, "plumbing plan," typically refers to a two-dimensional plan view of the plumbing system rather than a three-dimensional representation.<br /><br />Therefore, the correct answer is B. plumbing isometric drawing.