Final answer:
An overdose of insulin most likely results in low blood glucose or hypoglycemia, as excess insulin leads to excessive uptake of glucose from the blood into the cells.
Step-by-step explanation:
Among the options given for the effects of an overdose of insulin, the most likely occurrence would be low blood glucose, also known as hypoglycemia. Insulin promotes the uptake of glucose from the blood into the cells, and an excess amount of insulin would lead to too much glucose being cleared from the bloodstream, resulting in a deficiency of glucose in the blood. Symptoms of hypoglycemia can include muscle weakness, and in severe cases, unconsciousness or death if not promptly addressed. Unlike hypoglycemia, which is caused by an oversecretion of insulin, conditions such as ketoacidosis and hyperglycemia (high blood glucose) are typically associated with impaired insulin function or diabetes mellitus where there is insufficient insulin or it is not functioning properly, not with an overdose of insulin.