E definitely seems like the correct answer. I can't imagine a presentation being effective if the learner's attention is lost. Variety is the spice of life, after all!
I think the primary reason is to maintain learner attention and interest. Using a variety of media helps keep the presentation engaging and prevents it from becoming monotonous.
Vallie
2 days agoTerrilyn
12 days agoCecil
17 days agoDorothea
18 days agoElenora
25 days ago