The correct answer is: B. Exocrine glands.
Exocrine glands are glands that secrete substances onto an external or internal surface of the body. They are the most common type of gland in the body, and they produce a variety of substances, including sweat, saliva, digestive juices, and hormones.
Endocrine glands, on the other hand, are glands that secrete hormones directly into the bloodstream. Hormones are chemicals that regulate the activity of other cells in the body. The liver is an organ that performs a variety of functions, including detoxification, metabolism, and storage of nutrients. The spleen is an organ that is part of the lymphatic system. It helps to filter the blood and remove old red blood cells.
Here is a table that summarizes the differences between exocrine and endocrine glands:
| Characteristic | Exocrine glands | Endocrine glands |
| — | — | — |
| Location | Throughout the body | In the endocrine system |
| Secretions | Secretions are released onto an external or internal surface of the body | Secretions are released directly into the bloodstream |
| Substances secreted | Sweat, saliva, digestive juices, hormones | Hormones |
| Functions | Regulate the activity of other cells in the body | Regulate the activity of other cells in the body |
I hope this helps! Let me know if you have any other questions.