Let me go ahead and put a complete explanation up here.
Question type: Inference
(note: this is not a common wording for an Inference question, but it's the same gist as all Inference question stems ... "which answer choice is best supported by the facts provided?")
As always on Inference questions, your best friend is looking out for answer choices that go beyond what we were told:
- extreme words
- comparisons
- out of scope ideas
There's no core to examine, because Inference just gives us a set of facts (which the question stem normally calls 'statements', 'information', 'observations', or 'passage' .... as opposed to argument/reasoning)
(A) Super weak, easily supportable. The fact that digital documents have the property of 'being patterns of electronic signals' confers an advantage (doesn't generate waste) and a disadvantage (can easily be destroyed and lost forever).
(B) Sketchy comparison - we didn't get any information to quantify whether digital documents SOLVE more problems or CREATE more. We only know one good thing and one bad thing about them.
(C) Sketchy comparison - we never discussed the relative importance of preservation vs. accessibility.
(D) "never" eliminate is way too extreme to support from what we have.
(E) Nice, weak wording, but we don't have anything here to support an increase in "convenience". "Not generating waste" may qualify as environmental soundness (although we have no idea about the relative environmental hazards of the materials used in computers).
So (A) wins because we can match it up with information provided and because all the other answer choices had dealbreaker language that we couldn't support.
#officialexplanation