if your audience seems confused about a previous slide, in presenter view, whats the best way to jump back to a previous point in the presentation

Social networking sites d. online forumsthe first recognizable social media site,  six  degrees, was created in 1997. it enabled users to upload a profile and make friends with other users. in 1999, the first blogging sites became popular, creating a social media sensation that's still popular today.

i don’t know what it is