Which of the following is an example of an arthropod?

An arthropod is an invertebrate animal that belongs to the phylum Arthropoda, characterized by their exoskeleton, segmented bodies, and jointed appendages. Lice are a prime example of arthropods; they belong to the class Insecta, which includes all insects. Specifically, lice are parasitic insects that attach to their hosts and feed on blood.

Fleas, another valid example of arthropods, also belong to the class Insecta and share similar features such as an exoskeleton and jointed legs. Mites, categorized within the subclass Acari of arachnids, fall under the arthropod classification as well. However, worms, though they can be parasitic, are totally different, belonging to the phylum Annelida or Nematoda, which means they do not fit the definition of arthropods.

In this context, lice fit the specific criteria needed to define an arthropod, marking them as the correct answer in the question presented.