How does a training change a traditional profession into a modern profession

Which beliefs and principles in the declaration of independence and the u.s. constitution create a national identity? a.) belief in god, allegiance to popular sovereignty, and states’ rights. b.) free enterprise system, free trade system, and separation of powers. c.) individual freedom, political equality, and unalienable rights. d.) powerful executive branch, judicial review, and bicameral legislature.

Me with this psychology homework, i’m struggling with it.

If both the president and the vice president can no longer serve, who will become the next head of state?