Comprehensive and Detailed Explanation (Based on NREMT standards):
For a conscious adult with complete airway obstruction, abdominal thrusts are typically indicated. However, NREMT guidelines specify that chest thrusts should be used instead for patients who are morbidly obese or pregnant, because abdominal thrusts may be ineffective or unsafe.
Option D is correct because chest thrusts provide effective airway clearance while accommodating body habitus.
Options A and B are inappropriate for a conscious patient.
Option C is incorrect because abdominal thrusts may not be effective in morbidly obese patients.
NREMT stresses modifying airway obstruction techniques based on patient size and condition.
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