The correct option is A Mosquito
Complete metamorphosis is the event in which the insects pass through all the four stages in the life cycle. Mosquitoes show complete metamorphosis as they possess all the four stages as the egg, the larva or maggot, the pupa and the adult stage. The egg hatches to form a larvae. The larvae feeds and develops into pupa. The pupa is the resting stage. The pupa lives in the cocoon and then develops and matures to form the adult.
Thus, the correct answer is option B.