Choose the mass measurements that are in order from least to greatest

A 6.2 dekameters, 6.2 decimeters, 6.2 kilometers

B 7.4 kilograms, 7.4 decigrams, 7.4 centigrams

C 4.2 milligrams, 4.2 hectograms, 4.2 kilograms

Help pls :c