Final answer:
The figure represents a single p-orbital, which is characterized by its dum_bbell shape and orientation along one of the Cartesian axes. Therefore, the correct option is B.
Step-by-step explanation:
The figure represents a three-dimensional atomic orbital which is likely a single p-orbital. P-orbitals have a two-lobed, dum_bbell-shaped appearance, and there are three of them, each oriented along the x-, y-, and z-axes in Cartesian space. Given this description, the correct answer to the question 'Which orbital does it represent?' would be B. a single p-orbital.