Primitive living winged insects belong to the order:

Correct option is A

· Ephemeroptera (Mayflies) and Odonata (Dragonflies & Damselflies) are among the most primitive winged insects.
· These insects have incomplete metamorphosis (hemimetabolous development).
· Mayflies are the only insects that undergo a subimago stage before becoming adults.
· Odonata species are known for their large, membranous wings and aquatic nymph stages.