Corey is a 17-year-old high school student who loves sweets. His grandparents own a local candy shop, so he works part-time and eats sweets nearly every day. Although he's a relatively tall kid at 6 feet, 1 inch, he's a little stocky. His mom acknowledges that both Corey's father and grandfather are tall and stocky, but she is still worried about his health. He has an instinctive liking for sweets, so it is easy for him to overconsume the sugary treats at the shop. Corey is taking nutrition and health classes in school and is starting to think a little differently about his diet. The old saying "You are what you eat" has made an impression on him: he can't help but think how sweets have impacted his body and health. Corey was surprised to learn that, in addition to blood, another type of circulating body fluid flows within separate vessels. What is the name of this circulating fluid that doesn't contain red blood cells?
A. Urine
B. Mucus
C. Plasma
D. Lymph
E. Saliva