Carla needs to be able to quickly switch back and forth between open worksheets. Which option should she use?

idk

sorry.

but i may be able to identify that is not you < 3

answer is:

a). backstage view

explanation:

backstage view is the area where files and data about them is managed— creating, saving, printing, sending to others, inspecting for hidden metadata or personal information, and setting options. so in this way we can add many things to our document swiftly.

i hope you get the idea.