Answer:
C. Access the Slide Master view.
Step-by-step explanation:
PowerPoint application can be defined as a software application or program designed and developed by Microsoft, to avail users the ability to create various slides containing textual and multimedia informations that can be used during a presentation. Some of the features available on Microsoft PowerPoint are narrations, transition effects, custom slideshows, animation effects, formatting options etc.
In this scenario, Rosa needs to add a new slide layout to her presentation for the Sales users to add videos and other media in an easier fashion. Hence, what she should do first is to access the Slide Master view because this is used for changing the look or making adjustments to a PowerPoint slide.