Which of the following describes the volume of a solid figure?

The volume of a solid figure is defined as a measure of how much space that object occupies. This concept is fundamental in geometry, as it helps to quantify the three-dimensional extent of solids. Volume is typically expressed in cubic units, and it reflects the capacity of an object, indicating how much substance, such as liquid or gas, can fit inside it.

In contrast, other choices misrepresent what volume signifies. For instance, surface area pertains to the total area of the object's outer surfaces, weight is related to the mass of the object rather than its spatial dimensions, and perimeter only applies to the boundary length of two-dimensional shapes, not the volume of three-dimensional objects. Thus, option B correctly encapsulates the definition of volume in geometric terms.