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.

B
   I don't find it likely that a conference could be held, as it would consume unnecessary time when you can just present whatever it is you want to communicate in the classroom  (eliminate D, and C). You aren't a scientist if you're in a high-school classroom ( I wish you could be one, but you can't. You need a degree), therefore you cannot write official scientific journal articles (eliminate A).