Which of these describes observable properties of an object?

Observable properties of an object pertain to the characteristics that can be perceived through the senses. This includes features such as the look (color, shape), feel (texture), taste, sound, or smell of the object. These attributes allow individuals to describe the object in a tangible way, making B the correct answer.

In contrast, the internal structure and chemical composition of an object, while important, are not directly observable without specialized instruments or methods. The specific uses and functions of an object refer to what it can do or how it can be applied, which involves a different aspect unrelated to its direct sensory properties. Lastly, the historical significance of an object pertains to its context in time and culture, adding layers of meaning rather than describing the object itself in a sensory manner. Thus, B encapsulates the idea of observable characteristics best.