Which of the following insects belongs to the order Lepidoptera?

The correct answer is butterflies, as they are members of the order Lepidoptera. This order is characterized by insects that have two pairs of wings covered in scales, which is a distinguishing feature. The name "Lepidoptera" itself derives from Greek words meaning "scaly wings." Butterflies and moths, both categorized under this order, undergo complete metamorphosis, moving through a life cycle that includes the egg, larval (caterpillar), pupal (chrysalis), and adult stages.

In contrast, the other options represent different orders of insects. Ants belong to the order Hymenoptera, which also includes bees and wasps. Cockroaches are classified under the order Blattodea, which includes termites as well. Finally, beetles belong to the order Coleoptera, recognized for their hardened forewings known as elytra. Understanding these classifications helps in recognizing the diversity and characteristics of the insect world.