A) When using the phrase "candid world" the author is referring to a truthful and impartial world that will view the facts of the relationship between the American colonies and Great Britain before casting judgement.
B) The word choice shows the disatisfaction of the American colonies with the actions of King George III. Using the term tyrannical paints King George III as an irresponsible and unfair leader. This affects the intended audience of the text, as the goal of this Declaration was to get citizens behind the idea of becoming completely independent from Great Britain based on their recent treatment of American colonists.