Final answer:
Basins must be D) spaced apart in the autoclave to ensure proper sterilization by allowing steam to penetrate and contact all surfaces effectively.
Step-by-step explanation:
When sterilizing basins in the autoclave, they must be positioned to allow steam penetration and contact with all surfaces. This means that basins should not be nested inside each other or stacked in a way that could impede steam flow. The correct way to position basins for effective sterilization is Spaced apart. Each basin should be separated from the others to ensure that the pressurized steam can circulate freely around and inside them. This is essential for achieving proper sterilization, as overlapping or nested basins could create cool spots where microorganisms might survive the sterilization process.