Final answer:
For print documents, the raster effects should be set to a resolution of 300ppi to ensure high-quality prints that are clear and sharp, adhering to professional standards based on human visual acuity and Raleigh's criterion.
Step-by-step explanation:
The resolution that raster effects should be set to for print documents is 300ppi (A). This resolution ensures that the printed material has the necessary pixel density for clear, sharp images without visible dot patterns, meeting professional print quality standards. The explanation for requiring such a resolution comes from the Raleigh's criterion, which dictates the minimum separation of two dots such that they cannot be resolved by the human eye.
Taking into account that the human eye's pupil is about 3.0 mm and the average reading distance is 35 cm, the separation of dots on a printed page must be sufficiently small to not be distinguishable, translating to a high dots per inch (dpi) requirement. From this, we can determine that a 300ppi resolution translates to a high dpi suitable for print documents, while lower resolutions such as 150ppi, 450ppi, or 72ppi may not meet the standard print quality or may be unnecessarily high.