Which of these is bigger than a millimeter?

All of these options (centimeter, feet, meter) are bigger than a millimeter. A millimeter is a unit of length in the metric system, and it is equal to one thousandth of a meter. A centimeter is equal to one hundredth of a meter, which is bigger than a millimeter. Similarly, a foot is approximately 0.3048 meters, and a meter is equal to one meter, both of which are also bigger than a millimeter. Therefore, all of these options are correct.