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The hormone that is released when blood glucose levels decline is glucagon. Glucagon plays an essential role in maintaining blood glucose levels, especially during fasting or when the body requires additional glucose for energy. When blood sugar levels drop, glucagon is secreted by the alpha cells of the pancreas. Its primary function is to stimulate the liver to convert stored glycogen back into glucose, which is then released into the bloodstream to restore normal glucose levels.

Insulin, on the other hand, is released when glucose levels are elevated, such as after eating, to promote the uptake of glucose by cells. Adrenaline, while it does respond to stress and help increase blood glucose levels, is not directly involved in the regulation of blood glucose in the same way glucagon is. Lastly, cortisol, a hormone related to the stress response, can also influence blood sugar levels but is not specifically released solely in response to declining blood glucose. Therefore, glucagon is the primary hormone responsible for addressing low blood glucose levels, making it the correct answer.