Which statement below correctly identifies the difference between the endocrine system and other body systems?

• A. The organs of most other systems are typically connected or in close proximity, while the endocrine system is distributed throughout the body.
• B. The organs of other systems are embryologically linked while the endocrine organs develop from separate germ layers.
• C. The organs of other body systems only receive signals from the either the parasympathetic or sympathetic nervous system while the endocrine system receives signals from both.
• D. Organs of the endocrine system are the only organs in the body that produce hormones.