The copyright law permits educators to copy materials:

The correct answer highlights that copyright law allows educators to copy materials under clearly defined guidelines established to protect the rights of creators while enabling educational use. These guidelines typically fall under what's known as "fair use," which permits limited copying for purposes such as criticism, comment, news reporting, teaching, scholarship, or research.

These guidelines include restrictions on the amount of material that can be copied, the purpose for which it can be used, and the context within which it is shared. Educators need to be aware of these limitations to ensure they respect copyright laws, thus fostering a legal and ethical learning environment.

In comparison, the other options do not align with copyright regulations. The notion of copying "in any quantity without permission" goes against copyright principles, as it could infringe on the rights of the original creators. The idea that copying is permitted "for class distribution only" is too restrictive and doesn't reflect the broader allowances under fair use. Lastly, the stipulation of requiring "a class roster" does not influence copyright permissions; rather, it addresses logistical aspects of teaching that are unrelated to the legal frameworks surrounding copyright.