What’s the best description of a social media manager’s job?

A、Asocialmediamanagerhelpsbusinessestobuildtheironlinenetworks.
B、Asocialmediamanagerdesignswebsitesforbusinessesandindividuals.
C、Asocialmediamanagerworksondevelopingnewsocialmediaplatforms.
D、Asocialmediamanagerhelpspeopletoachievetheirgoalsthroughsocialmedia.