Final answer:
The chemical indicator for sterilizing nested basins should be placed near the bottom or in the center but closer to the base of the upper basin to ensure complete sterilization.The correct option is C.
Step-by-step explanation:
When sterilizing two large basins with smaller basins in one set, the chemical indicator should be placed in a position where it is most likely to be the last to be sterilized, which ensures the entire set is sterilized thoroughly. This is typically the most challenging area for sterilant penetration. Therefore, the chemical indicator should be placed at option C. In the center of the basins, but more specifically, it should be placed near the bottom or in the middle, but generally closer to the base of the upper basin, ensuring it is in the most difficult area for the sterilization agent to reach.
According to Steven's observation, since the only part not completely covered are the bottom few inches of the inside walls of the basin, beginning the placement of the indicator there would be a logical starting point. The floor of the basin is completely covered, suggesting that placing near the top would not be as effective a test of sterilization.