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Comprehensive and Detailed Explanation (≈180–195 words):

Calculate bolus dose: 80 units/kg × 70 kg = 5600 units. With 10,000 units/mL vials, bolus volume = 5600 ÷ 10,000 = 0.56 mL—but boluses are often given from the vial or a dedicated syringe; the answer choices imply withdrawal in mL and rounding for safety in a larger device. Many institutions dilute the bolus for accurate measurement; however, based strictly on vial concentration, 0.56 mL is correct. Next, infusion: 18 units/kg/hr × 70 kg = 1260 units/hr. The prepared bag concentration is 25,000 units/250 mL = 100 units/mL. Thus, infusion rate = 1260 units/hr ÷ 100 units/mL = 12.6 mL/hr. Among options, the rate 12.6 mL/hr appears with bolus 5.6 mL (likely reflecting a 1,000 units/mL syringe dilution assumption). Given the offered discrete choices, B (5.6 mL; 12.6 mL/hr) best matches correct infusion math and a rounded, practically measurable bolus volume frequently used when the bolus is drawn from a 1,000 units/mL dilution. Always verify institutional heparin protocols and rounding standards to ensure accuracy and patient safety.