The two correct answers that the writer can safely assume about the intended audience are:
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They have a basic knowledge of how social media works.
Given that the audience has been using an old social media platform, it is reasonable to assume they understand how social media operates, including concepts like posting, commenting, and connecting with friends. -
They have no knowledge about the new social media platform.
Since the audience is transitioning from an established platform to a new one that just started this year, it is likely they do not have prior experience or familiarity with the new platform.
The remaining options are not necessarily safe assumptions: audience members might represent a wide range of genders, their feelings toward the new platform could vary, and age distribution may also be diverse.