Answer to Question 1
Visual supporting materials are valuable because they help improve listener memory. After a few days, most listeners only remember 1025 percent of presentations, and some of that might be inaccurate because of varying frames of reference. Research confirms two principles to explain the role of visual aids in memory. The multimedia principle says that people learn significantly better when pictures are added to text. The contiguity principle says that people learn better when pictures are placed next to the words they illustrate. Learning doubles when pictures and graphics are used with text.
Answer to Question 2
C