The correct answer is "A: Social media has become an important tool in presidential campaigns."
Social media has become one of the main platforms for political parties to run their campaigns. Political party budgets have been reassigned in order to assign more resources into social media platforms, as the usage of traditional media like television and cable has decreased in comparison to the internet and social media.
Social media platforms are so important, that any action, whether it has positive or negative consequences, can represent a decisive factor in the outcome of the campaign.
