delta0211
Can someone tell me why wouldn't the answer be option 'C'?
That's an important question, because you'll see similar answer choices to many CR questions. When someone devises a plan and simply argues that the plan will achieve a certain goal, the person is
never assuming "this is the only way to achieve that goal" or "this is the best way to achieve that goal". They're only assuming the plan will work. So here, if a person argues "a violence rating system in the TV Guide will successfully warn parents about violent programming", that can still be true even if another system might also work, or even if another system might be even better. So those can't be assumptions; the person is not assuming this is the only way to warn parents, only that this system will do its job.
Everything I say above though would change if the argument was worded differently. If someone argued, say, "the only way to combat air pollution is by imposing a new tax on polluters", then because this includes the phrase "the only way", there is now a built-in assumption that no other method could work. The same would be true if an argument claimed a proposal was the "best way" to achieve a goal -- then the argument is assuming no other way could be better. So it can be important to read the wording carefully to know what types of assumptions you might be looking for.