1. (E)
Question type: Inference
Since a change in one particular input"”headlines"”created a strongly correlated change in output"”answers to questions about content"”it is reasonable to infer that headlines have some impact on reader interpretation.
(E) represents this idea and is therefore correct.
(A) is incorrect because it is too extreme.
(B) represents an incorrect interpretation of the argument.
(C) requires too many assumptions and is therefore not provable.
(D) is not provable.