Answer:
The medium that would show off the idea of a guide to all the countries national parks would be:
C. Print
Explanation:
The reason behind this is because radio and television would not let the watcher or listener go retrieve information in an organized way when needed. It would require to play the video and look for the information. While if it is printed he can access it very well organized, just like an encyclopedia. E-mail or regular mail would not be the best because e-mail would require bringing a computer, a tablet, or a cellphone and that is not as easy as a book. Also sending it by mail would damage it or people wouldn't be interested if we send them to everyone.
