If a rectangle has perimeter of 42 cm, what would be the perimeter of a similar rectangle if the dimensions were enlarged by a scale factor of 3? A.) The new perimeter would be the same, 42 cm.
B.) The new perimeter would be 126 cm, which is three times as large as the original.
C.) The new perimeter would be 378 cm, which is nine times as large as the original.
D.) The new perimeter would be 14, which is one-third the size of the original.