Final answer:
The set of smears likely to show better staining results is B) Three smears air-dried and stained with Romanowsky stains.
Step-by-step explanation:
The set of smears likely to show better staining results is B) Three smears air-dried and stained with Romanowsky stains. Romanowsky stains are a type of differential stain commonly used in microbiology. They provide better staining results by staining different cellular components with different colors, allowing for clearer visualization and identification of the cells under the microscope.