Typical methods of classroom scientific communication include
a. scientific journal articles, oral presentations, and internet collaboration.
b. lectures, lab reports, term papers, and poster presentations.
c. scientific journal articles, professional organizations, and conferences.
d. lectures, conferences, term papers, and technical journals.

Typical methods of classroom scientific communication depending on the level of study could include a range of these activities which have been listed in the answers. However, at the elementary, middle, and high school levels it would be safe to argue that the typical methods of communication are B) lectures, lab reports, term papers, and poster presentations. At higher levels would some of the other methods of communication be used such as scientific journals, oral presentations, lectured, conferences, etc. 

Very hard to understand