Final answer:
The best method to make a slide for evaluation of a viscous sample collected via fine-needle aspirate would be a Compression smear.
Step-by-step explanation:
The best method to make a slide for evaluation of a viscous sample collected via fine-needle aspirate would be Compression smear. A compression smear is made by gently pressing the sample between two slides, spreading the cells in a thin layer. This method allows for a single layer of cells to be achieved, making it easier to determine cell morphology and arrangement, and ensuring that all cells appear the same color, shape, and arrangement. It also helps in reducing the chances of visible contaminants.