Roberta, a recently hired manager, made a presentation at an office-wide meeting, relying on several visuals. While the presentation was useful, it was difficult to see where the visuals fit in. What recommendation would you give Roberta? Select one: O a. emphasize certain parts of the visuals O b. refer to the visuals with a pointer O c. don't block the view of the visuals O d. give more explanation of the visuals