Which of the following is a common type of flooring material?

Carpet is a common type of flooring material used in residential and commercial settings. It provides a soft, warm surface underfoot and is available in various colors, patterns, and textures, making it versatile for different design preferences and functional needs.

Concrete, while widely used in construction, serves primarily as a foundational material or for flooring in industrial settings and outdoor areas but isn't considered a traditional flooring material for interior spaces like carpet. Glass, although used in some flooring applications, is not common due to its fragility and the specialized installation requirements. Marble is a luxurious flooring option often seen in high-end settings, but its use is not as widespread as that of carpet, which can fit many budgets and styles easily. Thus, among the options provided, carpet stands out as the most representative of common flooring materials.