Final answer:
The contraindicated systolic blood pressure threshold for the administration of IV vasodilators is 110 mmHg.
Step-by-step explanation:
The contraindicated systolic blood pressure (SBP) threshold for the administration of IV vasodilators is 110 mmHg (C).
The recommended blood pressure typically should be less than 140/90 mmHg. However, when it comes to IV vasodilators, there is a specific lower threshold for the systolic pressure. The reason for this is that vasodilators cause the blood vessels to relax and widen, which can lower blood pressure even further. Therefore, to prevent excessive lowering of blood pressure, IV vasodilators should be avoided when the systolic blood pressure is below 110 mmHg.