A. Shriek
because being of key and to loud is a high pitch sound of a shriek
The voice in your head can say some is just wild so I would say 4.(to indicate strong emotions) because that voice in you head saying whatever but it’s good to use that when writing but not all the time .
Its a country of 50 states
its capital is Washington dc
it has the world largest economy
the president was barack obama
it has a multicultural society
if u need anymore just request it in the comments
I think it is D. I'm not sure let me know if I'm right.