What Would Be the Outcome If an Arthropod with an Exoskeleton

What would be the outcome if an arthropod with an exoskeleton lacked an outer epicuticle?

A) It would lack tanned chitin.
B) Joint movement, and therefore mobility, would be compromised.
C) Its exoskeleton would become too heavy.
D) It would no longer be able to control the movement of water through its exoskeleton.
E) Its exoskeleton would become too thin.