Which non-carbohydrate substrate is commonly used for gluconeogenesis during prolonged fasting?

• A. Triglycerides directly converted to glucose in adipose tissue without enzymatic processes.
• B. Amino acids derived from body protein breakdown.
• C. Cholesterol molecules that are easily deconstructed into glucose units in the bloodstream.
• D. Dietary fiber converted enzymatically by pancreatic amylase into glucose.

Answer: (B)