At a convention of the national communication association, one session consists of three speakers who each deliver a relatively prepared presentation, much like a public speech. after the speeches are presented, the audience asks questions of the speakers. this convention session most clearly follows the format known as the
(a) roundtable
(b) panel
(c) symposium
(d) symposium-forum

Option D.

Explanation:

Symposium-forum, is the right answer.

In symposium-forum, there are around three to four presenters and a chairperson. This format is most generally used in the events that provide opportunities to experts to propose their theory, findings, or their views about other experts' practices. In other words, the symposium is a convention or other assemblage for review of a topic, particularly one in which the members make presentations.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

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