Which cube is a unit cube?

A: a cube that is 11 centimeters long, 11 centimeters tall, and 11 centimeters high
B: a cube that is 9 inches long, 9 inches wide, and 9 inches high
C: a cube that is 1 yard long, 1 yard wide, and 1 yard high
D: a cube that is 3 meters long, 3 meters wide, and 3 meters high