Answer: The answer is the first optional figure, attached the image.
Step-by-step explanation: We are given to choose the correct base plan for the set of stacked cubes in the figure.
We see that the base of the stacked cubes matches with the first optional figure, where there are 2 cubes in the front, 2 cubes perpendicular to the front cubes and then 1 more cube placed perpendicular to them in the left.
Thus, the correct image is the first image, attached herewith.