You have been called to a local daycare facility for a sick child. At the scene, panicked daycare workers inform you that the 4-year-old child was lethargic all morning and wanted to sleep. After resting for several minutes, she began to "shake all over." This lasted for approximately 30 seconds. Your assessment reveals the patient to be responsive to painful stimuli and breathing adequately. Her airway is open and her radial pulse is strong and bounding. Her skin is hot and moist to the touch, with no signs of cyanosis. You are told that the patient has no medical history. En route to the hospital, the patient's mental status improves. Based on this presentation and information, you assume that the seizure occurred secondary to:

A) Hypoxia
B) Fever
C) Hypoglycemia
D) Altered mental status

B) Fever