Centimeters (cm) is a unit of length and litre is a measure of volume. A cubic centimeter is about one millilitre or twenty drops from an eyedropper. So since centimetre is not an appropriate unit and cubic centimeter would seem to be too small, litre would seem to be the only viable choice.
Heh. I think it's a choice of centimetres in height (say 167 with Marlbury maybe demanding about a 5 5/9 % tax upon delivery [I don't know Hayley's height so I'm using mine as a substitute]) versus litres of blood (say four buckets of 1.25 each- discounting solid portions).
Yeah, it's really "Do you want to be a solid or a liquid?" which was one of the other titles I considered.