Preston drew a blueprint of an additional room he is planning to add to his house. On the blueprint, 1 centimeter is equal to 3 feet in the actual room. If Preston wants the room to measure 9 feet by 12 feet, what are these dimensions on the blueprint?

A.
3 cm by 8 cm
B.
4 cm by 6 cm
C.
6 cm by 8 cm
D.
3 cm by 4 cm