Choice A rationale Temperature instability, particularly hypothermia, is a significant indicator of neonatal hypoglycemia. Glucose is the primary metabolic fuel for thermogenesis, and its deficiency impairs the infant's ability to maintain core body temperature. The normal newborn temperature range is typically 36.5°C to 37.5°C (97.7°F to 99.5°F). Choice B rationale Acrocyanosis, a bluish discoloration of the hands and feet, is a common and usually benign finding in newborns, especially in the first 24-48 hours, due to immature peripheral circulation. It does not directly indicate hypoglycemia; rather, it reflects normal physiological adaptation to extrauterine life. Choice C rationale Jitteriness, or tremors, is a classic neurological sign of hypoglycemia in newborns. The central nervous system is highly dependent on glucose for energy, and insufficient glucose supply can lead to neuronal excitability and involuntary muscle movements. This is often an early and prominent symptom. Choice D rationale Hypotonia, characterized by decreased muscle tone and floppiness, can be a symptom of severe or prolonged hypoglycemia. Glucose is essential for proper neuromuscular function, and its deprivation can impair nerve impulse transmission and muscle contraction, leading to reduced muscle resistance to passive movement. Choice E rationale Abdominal distention is typically associated with gastrointestinal issues such as feeding intolerance, bowel obstruction, or necrotizing enterocolitis. It is not a direct or common manifestation of hypoglycemia in newborns. Hypoglycemia primarily affects metabolic and neurological systems.