Answer:
The correct answer is option C. "the slow rate at which diffusion occurs over large distances".
Step-by-step explanation:
Circulatory systems help to maintain homeostasis by compensating from the slow rate at which diffusion occurs over large distances. Circulatory systems accelerate the rate of oxygen diffusion and allows that it reaches every part of the body, including the most distant areas from the heart, the organ that pumps blood to the whole body.