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I place a because after the statements of interest in the stimulus and the statement that makes sense with a because coming after it I deem to be the conclusion. Is this an ideal strategy for argument labeling and mp questions?
JY's explanation covers one reason why D is the correct answer. The other reason I found is that the argument does not effectively establish a causal relationship. The conclusion unjustly claims a lack of evidence means the evidence must have disappeared with age. There was no effective establishment that night lights caused nearsightedness therefore the last premise of the argument provides weak support at best to the arguments conclusion.