Portraits of Julia Domna and Her Two Sons Promoted the Idea

Portraits of Julia Domna and her two sons promoted the idea of felicitas saeculi, meaning that

A) the Severan princes were legitimate descendants of the Antonines because of Julia's family heritage.
B) Septimius Severus and Julia Domna celebrated the formal adoption of their two sons in official portraiture.
C) happiness and stability had returned to the Roman world because of the promise of peaceful succession.
D) the borders of Rome were secure and stable because of Caracalla's and Geta's military successes.