its related by all being a system
A. The circulatory system doesn't really control the body.
B. The respiratory system system helps the body by breathing. If you didn't breathe...you would die...
C. The system of ductless glands most certainly does control the body by the release of hormones that target organs and cause responses. Also referred to as endocrine glands or the endocrine system.
D. The skeletal system doesn't really control the body.