Hello!! I would say that the right answer would be A - Location of the gland because the endocrine glands are inside, hence the prefix "endo." Endocrine glands release hormones into the internal environment of body fluids. As for the exocrine glands, they enter tubes or ducts that lead to the body's surfaces. B, C, and D talk about hormones, which hormones are referred to the endocrine glands. I hope I helped you and gave the right answer you were looking for!! Have a great day. Let me know if you have any more questions. :)