The basic unit of length in the metric system is a meter.
Centimeter according to the metric system is one-hundredth of a meter and it is used to measure the length of objects that are less than 1 meter as 100 centimeters make up one meter.
The unit is abbreviated as cm.
Since in the given question we need to measure the length we have to use the metric system unit for length and since snicker is less than a meter, the most appropriate unit for its measurement would be centimeter.