Few places are so awash in information technology as the U. S. college campuses. And thanks to the explosive growth of the Internet, universities have intensified their efforts to wire the ivory tower. In many institutions, every student is armed with a personal computer along with an e-mail account, which ensures him fur access to the academic scene, because each college or university is hooked and logged on to an international on-line service. More and more faculty members are sending out syllabuses, notes, assignments, comments and even tests via e-mail, and students feel freer and more comfortable to communicate with their professors this way. The traditional structure of students sitting in classrooms in front of lecturers is being broken down.
It's now proper for an American college to have its presence on the World Wide Web, the inter-linked digital archive for Internet users. And students set up home pages (an opening screen with a list of contents) for the access of Web browsers. At a time when tuitions are already out of sight, colleges have to spend millions to keep up with the state of the art, Last spring, 10 Wharton students of U Penn posted a summary of a seminar on EU's agricultural grant-in-aid policies on the Internet, attracting some 300 electronic hangers-on from as far away as France, some of them bankers and farmers.
The program was so successful that the professor conducted another one last fall in the same manner.
But that raises concerns for some academicians, mostly from the prime school, who maintain there's a distinction between information and knowledge, and believe that the latter still requires a live teacher. They worry, as Thoreau did in his day, that we are in danger of becoming the tools of our tools. And those tools are getting smarter by the day.
It can be inferred from the passage that e-mailing is accessible only to those who ______.

A. investigate the invisible cyberspace
B. excel in the computer operational skills
C. subscribe to an on-line information service
D. share their thought and ideas generously