Given a rectangle with a length of 21 cm and a width of 3 cm, which rectangle is similar?
A) A rectangle with a length of 15 cm and a width of 5 cm.
B) A rectangle with a length of 27 cm and a width of 3 cm.
C) A rectangle with a length of 35 cm and a width of 5 cm.
D) A rectangle with a length of 54 cm and a width of 6 cm.