The main difference between theReaders' Guide to Periodical Literature and resources like EBSCOhost and Expanded Academic ASAP is that the Readers' Guideis 

 A. only accessed in a library, while the other resources can be accessed online from anywhere.

   B. more universally accepted in an academic setting than the other indexes.  

 C. a basic index, while the other resources are full databases allowing access to actual articles.   

D. older and more comprehensive than the newer, online indexes.

ITS C! I got it