The nurse anecdote illustrates:

• A. The effectiveness of vaccines
• B. Hospital policy compliance
• C. The danger of complacency
• D. The need for expensive equipment

Answer: (C)

The main idea being tested is that complacency can undermine safety in healthcare. In nursing, patient safety hinges on staying vigilant, following procedures, and double-checking details even when things feel routine. The anecdote highlights how easily a momentary lapse—assuming “it’s fine” because it’s happened before—can open the door to errors or near-misses. That focus on how ease and familiarity can erode careful practice is why this is about the danger of complacency.

The other ideas aren’t the focus here: the scenario isn’t about proving vaccines are effective, nor is it primarily about following hospital policy, and it doesn’t hinge on the need for expensive equipment. It’s the risk that routine, complacent thinking poses to patient safety.