Final answer:
Gloves should be changed after every single use to prevent the spread of infections and maintain a sterile environment in healthcare settings.
Step-by-step explanation:
When it comes to changing gloves, health-care workers should follow specific guidelines to ensure safety and prevent the spread of infections. The correct answer is a) after every single use. Gloves should be changed after each use to prevent cross-contamination between different patients or surfaces. This practice is crucial for maintaining a sterile environment and safeguarding the well-being of both patients and health-care providers.