How Has Social Media Changed Presidential Public Appeals

How has social media changed presidential public appeals?

A) It has increased the likelihood that citizens will be exposed to presidential messages.
B) It has decreased their effectiveness because no one is sure whether the White House's social media messages are coming from the president or from low-level staff.
C) It contributes to the fragmentation of the general public into small subgroups, so it is more difficult for a president to reach all citizens.
D) Presidential appeals are now much more visual, with White House staff taking care to create interesting visual images of the president.