Answer:
Option D. 1350 mm² is the answer.
Explanation:
In the given picture the cubes are arranged in a way that only 6 faces of the cubes are visible. Each side of the cubes are 15 mm.
So area of the each face of a cube = 15×15 = 225 mm²
Since there are 6 faces visible so total area of the picture = 6×225 = 1350 mm²
Option D. 1350 mm² is the answer.