Answer:
B. Presentations
Explanation:
By evaluating the question, you can tell that the answer we are looking for can be in a form of printed, written, audio, figures, images and or illustrations that speakers utilizes during discussions. Languages is obviously not the answer, so option A is incorrect. Authentic texts are written or printed only and visual materials can only be in a form of figures, drawings and images so basically option C and D is incorrect also. Presentations, on the other hand can exist in any form and is widely used by speakers on campaigns and events globally thus making option B the correct answer.
