D. a trade off is the concept that with every decision, you get something and give something else up
The commonwealth of Nations is an organisation uniting the former members of the British Empire: so the answer is: the British Empire.
Some, but not all (16 out of 50) of the countries of the Commonwealth recognize Queen Elisabeth II as their monarch.
(A) Increases the likelihood of aggressive behavior.
source https://mobile.nytimes.com/2013/02/12/science/studying-the-effects-of-playing-violent-video-games.html?pagewanted=all&
"A dose of violent gaming makes people act a little more rudely than they would otherwise"
