Which of the following is the most commonly used building material and is inexpensive to produce?

Wood is the most commonly used building material and is inexpensive to produce due to several factors. It is widely available and can be sourced sustainably from forests, making it both an economically viable and environmentally friendly choice. The ease of handling and cutting wood allows for quick assembly and construction, which contributes to its popularity, especially in residential building.

Additionally, compared to alternatives like steel, plastics, and concrete, the production and transportation costs of wood are typically lower. This affordability makes it accessible for various construction projects, ranging from simple structures to more complex builds. The favorable strength-to-weight ratio and natural insulation properties further enhance its appeal, ensuring that wood remains a dominant material in the building industry.