Rhonda used unit cubes to make a rectangular prism. what is the volume of the prism?

what is the volume of the prism?
A.14 cubic units
B.21 cubic units
C.42 cubic units
D.63 cubic units

There is not enough information to determine the volume of the prism without knowing the dimensions of the rectangular prism formed by the unit cubes. Each unit cube represents 1 cubic unit of volume, so the volume of the prism would be the number of unit cubes used to construct it. Can you please provide the dimensions of the prism?