Answer:
The correct answer is "an open circulatory system".
Step-by-step explanation:
Larvae that have exoskeleton, system of tubes for gas exchange, and modified segmentation lead to the formation of adult insects that have an open circulatory system. The system of tubes for gas exchange of the larva are modified once metamorphosis occurs, forming air-filled tubes called tracheae that serves to the adult insect to perform respiration within an open circulatory system.