Answer:
D
Explanation:
A is a grammarian
B: is an archeologist
C: I'm not sure what C is, but it is not the answer.
D: is the study of the duties and rights of citizenship.
I believe the correct answers are Facebook and Twitter.
Given that he understands the popularity of such social medias and how they can be used for public communications, he did use them quite effectively. He is not the only president to do that, as President Trump is also quite active on Twitter.
I believe a dragon is featured on both the Bhutan and Wales flags.
Hope it helps!
