D because it is comparing two things for clarification.
There is a run on sentence
Changing the wallpaper can help enhance the appearance of your computer's desktop, please change the subject to what your asking which is technology.
C.
"...<u>without regard to partizanship</u>, we are committed to <u>full support of all</u> those resolute peoples, everywhere, who are <u>resisting aggression</u>" means 'Working together, America will help those who are fighting against tyranny.'
Answer:
The United States of America is a North American nation that is the world's most dominant economic and military power. Likewise, its cultural imprint spans the world, led in large part by its popular culture expressed in music, movies and television.
