In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to study the medical syndrome of hyperkalemia in humans [title] Study the electrolyte disturbance of k + in the body of humans. [step] This article discusses the electrolyte disturbance of k + ions that is called clinically hyperglycemia. This is one medical syndrome that is manifested by excessive amount of k + ions in the extracellular space between the cells of the body and in the blood plasma. <sep> (A) This excess of this ion in the body has many causes and is associated with distinct clinical symptoms. These clinical symptoms are the direct result of its physiological function in the body. (B) [title] Learn about the hyperkalemia of humans. [step] This type of hyperkalemia causes seizures, due to insulin loss due to excessive hyperglycemia in the cells. (C) This is referred to as the patient's " hypoglycemia syndrome. " [title] Learn about the causes of chronic hypoglycemia. (D) These ions are not necessary for the anatomy and function of the blood vessels. These ions are fed downward through the veins of the kidney.
A