Answer: A- segmentation
Explanation:
Both Millipedes and centipedes are arthropods with jointed legs and multiple segments. While millipedes are flattened slightly with multi segmented bodies, where the first segment is usually legless, while the second to the fourth are characterised with two legs and then the rest have four legs.
A centipede on the other hand, is a multi segmented anthropod a pair of legs on each segment, and their legs range from 30 to 354 on their one inch length bodies, which are known to be longer than that of millipedes.