The correct answer is B) clear airways. When administering artificial respiration, the most important step is to clear the victim's airway. This ensures that there are no obstructions preventing air from reaching the lungs. Clearing the airway takes priority over other techniques, as the victim cannot be effectively ventilated if their breathing passage is blocked. The other answer choices are not as critical. Monitoring blood pressure is not the immediate priority, knowing all approved methods is not as important as performing the essential steps, and the rhythmic pressure method is just one of several valid techniques for providing rescue breaths.