How will the excretory system respond when an animal is thirsty?

Based on my research, here are the choices for the given question above.

A. by relaxing the striated muscles

B. by retaining body fluids

C. by absorbing heat from the digestive glands

D. by releasing hormones

Well, the answer is B. by retaining body fluids. When an animal is thirsty they need fluid that's why they are trying to retain their body fluids.