Final answer:
A. larva
In complete metamorphosis of arthropods, the nymph stage is not included; these stages are egg, larva, pupa, and adult.
Step-by-step explanation:
The stages in the complete metamorphosis of arthropods include the egg, larva, pupa, and adult stages. However, the nymph stage is not part of this process. In complete metamorphosis, after the arthropod hatches from the egg, it emerges as a larva, which is very different in form and function from the adult. The larva grows and eventually enters the pupal stage, which is a period of reorganization where the larval tissues break down and the insect transforms into the adult form.
The adult stage is the final stage where the insect becomes reproductively mature. In contrast, insects that undergo incomplete metamorphosis develop through a series of nymph stages, gradually resembling the adult more closely with each molt until they are fully grown.The nymph stage is associated with incomplete metamorphosis where insects gradually mature without a pupal stage.