Final answer:
The minimum size for scaffold plates on which feet or jacks rest is 8 inches by 8 inches.
Step-by-step explanation:
The minimum size for scaffold plates on which feet or jacks rest is 8 inches by 8 inches. This is based on newer work that suggests a scale factor of up to 8 diameters for the side-to-side dimension and 15 diameters for the depth. Therefore, the correct answer is option B.