Which is the best revision of the conclusion? Read the excerpt from a student's essay.
Video games can be fun and educational if used wisely.
Unfortunately, they can also be a time waster. School
students have to be careful and use video games wisely.
Some video games are violent. Some children play
video games too often and don't do more productive
activities. I hope you can all be more careful with video
games
O Kids need to watch out for dangerous video games.
Kids must use good judgement when playing video
games.
Kids should spend more time playing video games.
o Kids will be happier if they never play video games.

the speech this question is referring to is president kennedy's special message to the congress on urgent national needs, may 25, 1961

kennedy responds in a very direct and concrete way to those thinking that communism is a positive system:

"yet their aggression is more often concealed than open. they have fired no missiles; and their troops are seldom seen. they send arms, agitators, aid, technicians and propaganda to every troubled area. but where fighting is required, it is usually done by others--by guerrillas striking at night, by assassins striking alone--assassins who have taken the lives of four thousand civil officers in the last twelve months in vietnam alone--by subversives and saboteurs and insurrectionists, who in some cases control whole areas inside of independent nations." (kennedy)

president kennedy presents communism as cowardly, as a hidden and treacherous weapon that strikes from the shadows like thieves, he represents the system as not even being capable of showing and open and overt attack or confrontation. to finish up the response, he expresses that the system attacks even a country's idependence and freedom.

op: object of preposition

i would pick a. i think this is more of a personal question though.