Which one of the enumerated powers of congress is most closely related to the broad but vague executive powers of the president?

Which of these statements best describes the ambiguity in this excerpt

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Why did louis xvi call a meeting of the estates-general in 1789? how long had it been since such a meeting had been called?