Researchers in two different studies compared children who had slept w

Researchers in two different studies compared children who had slept with nightlights in their rooms as infants to children who had not. In the first study, the children who had slept with night-lights proved more likely to be farsighted, but the second study found negligible correlation between farsightedness and night-lights. Admittedly, the children in the first study were younger than those in the second one. Thus, if night-lights cause farsightedness, the effect disappears with age.

Which one of the following, if true, would most weaken the argument above?


(A) A third study comparing infants who were currently sleeping with night-lights to infants who were not found strong correlation between night-lights and nearsightedness.

(B) The second study in which negligible correlation was found did not examine sufficient number of children to provide significant support for any conclusion regarding a causal relationship between night-lights and farsightedness.

(C) In a recent study involving 150 children who were older than those in any of the two studies, most children who had slept with night-lights as infants were nearsighted.

(D) On average, young children who are already very farsighted are no more likely to sleep with night-lights than young children who are not already farsighted.

(E) In a study involving children who had not slept with night-lights as infants but had slept with night-lights when they were older, most of the children studied were not farsighted.