All insects have how many parts of legs?

Option D is incorrect because insects have 6 legs, not 4.

Insects are a group of invertebrates that have a hard exoskeleton, a segmented body, and three pairs of jointed legs. They are the most diverse group of animals on Earth, with over 1 million known species. Insects play an important role in the environment, as pollinators, decomposers, and predators.