If each side of a cube is doubled, its surface area
Let the side of the cube be “a” unit
Original Surface area = 6a2 sq units
Now, when each side of a cube is doubled than its surface area:
New surface area = 6 (2a2) sq units
= 24a2 sq units
Therefore, the surface area of the cube is 4 times than its original area
Hence, option B is correct