Which of these would complete the diagram?

a.

the book of common prayer

b.

the petrarchan style sonnet

c.

the italian university system

d.

the gutenberg printing press
(pleas don't answer i got the answer at 1: 41 pm that was right after i sent this in. sorry ; p )

Everyone.. i would think?

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states